//最后修订版本号:$revision: 28 $
//最后修改人:$author: admin $
//最后修改时间:$date: 2009-07-20 18:03:52 +0800 (星期一, 2009-07-20) $
/*********************************************************************************************/
/*功能:jq插件图片预载入等比居中缩放*/
/*********************************************************************************************/
jquery.fn.loadimage=function(width,height,txtheight,loadpic){
    if(loadpic==null)loadpic="/upfiles/system/loading.gif";
	return this.each(function(){
		var t=$(this);
		//取父框div.img的内外框值
				var	parentpadtop=math.round(t.parent().css("padding-top").replace(/\d/g,''));
				var	parentpadbom=math.round(t.parent().css("padding-bottom").replace(/\d/g,''));
				var	parentmarbom=math.round(t.parent().css("margin-bottom").replace(/\d/g,''));
				var	parentmartop=math.round(t.parent().css("margin-top").replace(/\d/g,''));
				var	parentpadlft=math.round(t.parent().css("padding-left").replace(/\d/g,''));
				var	parentpadrgt=math.round(t.parent().css("padding-right").replace(/\d/g,''));
				var	parentmarlft=math.round(t.parent().css("margin-left").replace(/\d/g,''));
				var	parentmarrgt=math.round(t.parent().css("margin-right").replace(/\d/g,''));
				var	parentbdrgt=math.round(t.parent().css("border-right-width").replace(/\d/g,''));
				var	parentbdlft=math.round(t.parent().css("border-left-width").replace(/\d/g,''));
				var	parentbdtop=math.round(t.parent().css("border-top-width").replace(/\d/g,''));
				var	parentbdbom=math.round(t.parent().css("border-bottom-width").replace(/\d/g,''));
				var	boxwidth=parentbdlft+parentpadlft+parentmarlft+parentbdrgt+parentpadrgt+parentmarrgt;
				var	boxheight=parentbdtop+parentpadtop+parentmartop+parentbdbom+parentpadbom+parentmarbom;
		//设定父级外框a元素高度
		var aheight=height+txtheight;		
		t.parent().parent().css({height:aheight,width:width});
		var src=$(this).attr("src");
		var img=new image();
		//alert("loading...")
		img.src=src;
		//自动缩放图片
		var autoscaling=function(){
			
			
				if(img.width>0 && img.height>0){ 
			        if(img.width/img.height>=width/height){ 
			            if(img.width>width){ 
			                t.width(width-boxwidth); 
			                t.height((img.height*width)/img.width-boxheight); 
			            }else{ 
			                t.width(img.width-boxwidth); 
			                t.height(img.height-boxheight); 
			            } 
			        } 
			        else{ 
			            if(img.height>height){ 
			                t.height(height-boxwidth); 
			                t.width((img.width*height)/img.height-boxheight); 
			            }else{ 
			                t.width(img.width-boxwidth); 
			                t.height(img.height-boxheight); 
			            } 
			        } 
			    } 
				
				if (t.height()<height){
					//取父padding和margin值

					var temppad=math.abs(math.round((height-t.height()-boxwidth)/2));
					t.css({"margin-top":temppad});
					t.css({"margin-bottom":temppad});
				}
				if (t.width()<width){

					var temppad2=math.abs(math.round((width-t.width()-boxheight)/2));
					t.css({"margin-left":temppad2});
					t.css({"margin-right":temppad2});
				}

			}	
	
		//处理ff下会自动读取缓存图片
		if(img.complete){
		    //alert("gettocache!");
			autoscaling();
		    return;
		}
		$(this).attr("src","");
		var loading=$("<img alt=\"加载中...\" title=\"图片加载中...\" src=\""+loadpic+"\" />");
		
		t.hide();
		t.after(loading);
		$(img).load(function(){
			autoscaling();
			loading.remove();
			t.attr("src",this.src);
			t.css()
			t.show();
			//alert("finally!")
		});
		
	});
}
/*********************************************************************************************/
/*功能:jq插件页面漂浮在线qq之类*/
/*********************************************************************************************/
jquery.fn.jfloat = function(o) {
    
        o = $.extend({
            top:60,  //广告距页面顶部距离
            left:0,//广告左侧距离
            right:0,//广告右侧距离
            width:100,  //广告容器的宽度
            height:360, //广告容器的高度
            minscreenw:800,//出现广告的最小屏幕宽度，当屏幕分辨率小于此，将不出现对联广告
            position:"left", //对联广告的位置left-在左侧出现,right-在右侧出现
            allowclose:true //是否允许关闭 
        }, o || {});
		var h=o.height;
      var showad=true;
      var fdiv=$(this);
      if(o.minscreenw>=$(window).width()){
          fdiv.hide();
          showad=false;
       }
       else{
		   fdiv.css("display","block")
           var closehtml='<div align="right" style="padding:2px;z-index:2000;font-size:12px;cursor:pointer;border-bottom:1px solid #f1f1f1; height:20px;" class="closefloat"><span style="border:1px solid #000;height:12px;display:block;width:12px;">×</span></div>';
           switch(o.position){
               case "left":
                    if(o.allowclose){
                       fdiv.prepend(closehtml);
					   $(".closefloat",fdiv).click(function(){$(this).hide();fdiv.hide();showad=false;})
					   h+=20;
					}
                    fdiv.css({position:"absolute",left:o.left+"px",top:o.top+"px",width:o.width+"px",height:h+"px",overflow:"hidden"});
                    break;
               case "right":
                    if(o.allowclose){
                       fdiv.prepend(closehtml)
					   $(".closefloat",fdiv).click(function(){$(this).hide();fdiv.hide();showad=false;})
					   h+=20;
					}
                    fdiv.css({position:"absolute",left:"auto",right:o.right+"px",top:o.top+"px",width:o.width+"px",height:h+"px",overflow:"hidden"});
                    break;
            };
        };
        function ylfloat(){
            if(!showad){return}
            var windowtop=$(window).scrolltop();
            if(fdiv.css("display")!="none")
                fdiv.css("top",o.top+windowtop+"px");
        };

      $(window).scroll(ylfloat) ;
      $(document).ready(ylfloat);     
       
    }
/*********************************************************************************************/
/*功能:jq插件横向滚动使用*/
/*********************************************************************************************/
jquery.fn.jmarquee = function(o) {
    o = $.extend({
    speed:30,
    step:1,//滚动步长
    direction:"up",//滚动方向
    visible:1//可见元素数量
    }, o || {});
    //获取滚动内容内各元素相关信息
    var i=0;
    var div=$(this);
    var ul=$("ul",div);
    var tli=$("li",ul);
    var lisize=tli.size();
    if(o.direction=="left")
        tli.css("float","left");
    var liwidth=tli.innerwidth();
    var liheight=tli.height();
    var ulheight=liheight*lisize;
    var ulwidth=liwidth*lisize;
  
    //如果对象元素个数大于指定的显示元素则进行滚动，否则不滚动。
    if(lisize>o.visible){
        ul.append(tli.slice(0,o.visible).clone())  //复制前o.visible个li，并添加到ul的最后
        li=$("li",ul);
        lisize=li.size();
        
          //给滚动内容添加相关css样式
        div.css({"position":"relative",overflow:"hidden"});
        ul.css({"position":"relative",margin:"0",padding:"0","list-style":"none"});
        li.css({margin:"0",padding:"0","position":"relative"});
        
        switch(o.direction){
            case "left":
                div.css("width",(liwidth*o.visible)+"px");
                ul.css("width",(liwidth*lisize)+"px");
                li.css("float","left");
                break;
            case "up":
                div.css({"height":(liheight*o.visible)+"px"});
                ul.css("height",(liheight*lisize)+"px");
                break;
        }
        
       
        var mymar=setinterval(ylmarquee,o.speed);
        ul.hover(
            function(){clearinterval(mymar);},
            function(){mymar=setinterval(ylmarquee,o.speed);}
        );
    };
    function ylmarquee(){
         
        if(o.direction=="left"){
            if(div.scrollleft()>=ulwidth){
                div.scrollleft(0);
            }
            else
            {
                var leftnum=div.scrollleft();
                leftnum+=parseint(o.step);
                div.scrollleft(leftnum)
            }
        }
        
        if(o.direction=="up"){
            if(div.scrolltop()>=ulheight){
               div.scrolltop(0);
                
            }
            else{
               var topnum=div.scrolltop();
               topnum+=parseint(o.step);
               div.scrolltop(topnum);
            }
        }
        
    };
   
}
/*********************************************************************************************/
/*功能:jq插件页面等高使用*/
/*********************************************************************************************/
$.fn.equalheights = function(px) {
	$(this).each(function(){
		var currenttallest = 0;
		$(this).children().each(function(i){
			if ($(this).height() > currenttallest) { currenttallest = $(this).height(); }
		});
		if (!px || !number.prototype.pxtoem) currenttallest = currenttallest.pxtoem(); //use ems unless px is specified
		// for ie6, set height since min-height isn't supported
		if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({'height': currenttallest}); }
		$(this).children().css({'min-height': currenttallest}); 
	});
	return this;
};

// just in case you need it...
$.fn.equalwidths = function(px) {
	$(this).each(function(){
		var currentwidest = 0;
		$(this).children().each(function(i){
				if($(this).width() > currentwidest) { currentwidest = $(this).width(); }
		});
		if(!px || !number.prototype.pxtoem) currentwidest = currentwidest.pxtoem(); //use ems unless px is specified
		// for ie6, set width since min-width isn't supported
		if ($.browser.msie && $.browser.version == 6.0) { $(this).children().css({'width': currentwidest}); }
		$(this).children().css({'min-width': currentwidest}); 
	});
	return this;
};
number.prototype.pxtoem = string.prototype.pxtoem = function(settings){
	//set defaults
	settings = jquery.extend({
		scope: 'body',
		reverse: false
	}, settings);
	
	var pxval = (this == '') ? 0 : parsefloat(this);
	var scopeval;
	var getwindowwidth = function(){
		var de = document.documentelement;
		return self.innerwidth || (de && de.clientwidth) || document.body.clientwidth;
	};	
				
	if (settings.scope == 'body' && $.browser.msie && (parsefloat($('body').css('font-size')) / getwindowwidth()).tofixed(1) > 0.0) {
		var calcfontsize = function(){		
			return (parsefloat($('body').css('font-size'))/getwindowwidth()).tofixed(3) * 16;
		};
		scopeval = calcfontsize();
	}
	else { scopeval = parsefloat(jquery(settings.scope).css("font-size")); };
			
	var result = (settings.reverse == true) ? (pxval * scopeval).tofixed(2) + 'px' : (pxval / scopeval).tofixed(2) + 'em';
	return result;
};

/*********************************************************************************************/
/*功能:jq插件,幻灯图片*/
/*********************************************************************************************/
jquery.fn.focusimg=function(){
 var obj=$(this);
 objname=obj.attr("id");
 obj.children("ul").attr("id",objname+"-fragment");
 var num=(obj.children("ul").children("li").length)-1;
 var temp_b=new string();
 for(var i=0;i<=num;i++){
  temp_b+="<a id=\""+objname+"-button-"+i+"\" href=\"#"+objname+"-fragment-"+i+"\">"+(i+1)+"</a>";
  obj.children("ul").children("li").eq(i).attr("id",objname+"-fragment-"+i)
 }
 obj.append("<span id='"+objname+"-button'>"+temp_b+"</span>");
 obj.children("span").children("a").eq(num).addclass("a2");

 obj.children("span").children("a").click(function(){
   obj.children("span").children("a").removeclass("a2");
   $(this).addclass("a2");
   var id=($(this).attr("id")).replace("button","fragment");
   $("#"+id).appendto(obj.children("ul"));
   return false;
 });

 topboxrun=function(){
  obj.children("ul").children("li").eq(num).fadeout("slow",function(){
   obj.children("span").children("a").removeclass("a2");
   var id=($(this).prev().attr("id")).replace("fragment","button");
   $("#"+id).addclass("a2");
   $(this).prependto(obj.children("ul"));
   $(this).show();
  }); 
 }

 var t=setinterval(topboxrun,3000);
}

/*********************************************************************************************/
/*功能:jq插件,横向竖直两用多级ul li形菜单*/
/*********************************************************************************************/
var ddsmoothmenu={

//specify full url to down and right arrow images (23 is padding-right added to top level lis with drop downs):
arrowimages: {down:['downarrowclass', 'down.gif', 23], right:['rightarrowclass', 'right.gif']},

transition: {overtime:300, outtime:300}, //duration of slide in/ out animation, in milliseconds
shadow: {enabled:true, offsetx:5, offsety:5},

///////stop configuring beyond here///////////////////////////

detectwebkit: navigator.useragent.tolowercase().indexof("applewebkit")!=-1, //detect webkit browsers (safari, chrome etc)
detectie6: document.all && !window.xmlhttprequest,

getajaxmenu:function($, setting){ //function to fetch external page containing the panel divs
	var $menucontainer=$('#'+setting.contentsource[0]) //reference empty div on page that will hold menu
	$menucontainer.html("loading menu...")
	$.ajax({
		url: setting.contentsource[1], //path to external menu file
		async: true,
		error:function(ajaxrequest){
			$menucontainer.html('error fetching content. server response: '+ajaxrequest.responsetext)
		},
		success:function(content){
			$menucontainer.html(content)
			ddsmoothmenu.buildmenu($, setting)
		}
	})
},


buildmenu:function($, setting){
	var smoothmenu=ddsmoothmenu
	var $mainmenu=$("#"+setting.mainmenuid+">ul") //reference main menu ul
	$mainmenu.parent().get(0).classname=setting.classname || "ddsmoothmenu"
	var $headers=$mainmenu.find("ul").parent()
	$headers.hover(
		function(e){
			$(this).children('a:eq(0)').addclass('selected')
		},
		function(e){
			$(this).children('a:eq(0)').removeclass('selected')
		}
	)
	$headers.each(function(i){ //loop through each li header
		var $curobj=$(this).css({zindex: 100-i}) //reference current li header
		var $subul=$(this).find('ul:eq(0)').css({display:'block'})
		this._dimensions={w:this.offsetwidth, h:this.offsetheight, subulw:$subul.outerwidth(), subulh:$subul.outerheight()}
		this.istopheader=$curobj.parents("ul").length==1? true : false //is top level header?
		$subul.css({top:this.istopheader && setting.orientation!='v'? this._dimensions.h+"px" : 0})
		$curobj.children("a:eq(0)").css(this.istopheader? {paddingright: smoothmenu.arrowimages.down[2]} : {}).append( //add arrow images
			'<img src="'+ (this.istopheader && setting.orientation!='v'? smoothmenu.arrowimages.down[1] : smoothmenu.arrowimages.right[1])
			+'" class="' + (this.istopheader && setting.orientation!='v'? smoothmenu.arrowimages.down[0] : smoothmenu.arrowimages.right[0])
			+ '" style="border:0;" />'
		)
		if (smoothmenu.shadow.enabled){
			this._shadowoffset={x:(this.istopheader?$subul.offset().left+smoothmenu.shadow.offsetx : this._dimensions.w), y:(this.istopheader? $subul.offset().top+smoothmenu.shadow.offsety : $curobj.position().top)} //store this shadow's offsets
			if (this.istopheader)
				$parentshadow=$(document.body)
			else{
				var $parentli=$curobj.parents("li:eq(0)")
				$parentshadow=$parentli.get(0).$shadow
			}
			this.$shadow=$('<div class="ddshadow'+(this.istopheader? ' toplevelshadow' : '')+'"></div>').prependto($parentshadow).css({left:this._shadowoffset.x+'px', top:this._shadowoffset.y+'px'})  //insert shadow div and set it to parent node for the next shadow div
		}
		$curobj.hover(
			function(e){
				var $targetul=$(this).children("ul:eq(0)")
				this._offsets={left:$(this).offset().left, top:$(this).offset().top}
				var menuleft=this.istopheader && setting.orientation!='v'? 0 : this._dimensions.w
				menuleft=(this._offsets.left+menuleft+this._dimensions.subulw>$(window).width())? (this.istopheader && setting.orientation!='v'? -this._dimensions.subulw+this._dimensions.w : -this._dimensions.w) : menuleft //calculate this sub menu's offsets from its parent
				if ($targetul.queue().length<=1){ //if 1 or less queued animations
					$targetul.css({left:menuleft+"px", width:this._dimensions.subulw+'px'}).animate({height:'show',opacity:'show'}, ddsmoothmenu.transition.overtime)
					if (smoothmenu.shadow.enabled){
						var shadowleft=this.istopheader? $targetul.offset().left+ddsmoothmenu.shadow.offsetx : menuleft
						var shadowtop=this.istopheader?$targetul.offset().top+smoothmenu.shadow.offsety : this._shadowoffset.y
						if (!this.istopheader && ddsmoothmenu.detectwebkit){ //in webkit browsers, restore shadow's opacity to full
							this.$shadow.css({opacity:1})
						}
						this.$shadow.css({overflow:'', width:this._dimensions.subulw+'px', left:shadowleft+'px', top:shadowtop+'px'}).animate({height:this._dimensions.subulh+'px'}, ddsmoothmenu.transition.overtime)
					}
				}
			},
			function(e){
				var $targetul=$(this).children("ul:eq(0)")
				$targetul.animate({height:'hide', opacity:'hide'}, ddsmoothmenu.transition.outtime)
				if (smoothmenu.shadow.enabled){
					if (ddsmoothmenu.detectwebkit){ //in webkit browsers, set first child shadow's opacity to 0, as "overflow:hidden" doesn't work in them
						this.$shadow.children('div:eq(0)').css({opacity:0})
					}
					this.$shadow.css({overflow:'hidden'}).animate({height:0}, ddsmoothmenu.transition.outtime)
				}
			}
		) //end hover
	}) //end $headers.each()
	$mainmenu.find("ul").css({display:'none', visibility:'visible'})
},

init:function(setting){
	if (typeof setting.customtheme=="object" && setting.customtheme.length==2){ //override default menu colors (default/hover) with custom set?
		var mainmenuid='#'+setting.mainmenuid
		var mainselector=(setting.orientation=="v")? mainmenuid : mainmenuid+', '+mainmenuid
		document.write('<style type="text/css">\n'
			+mainselector+' ul li a {background:'+setting.customtheme[0]+';}\n'
			+mainmenuid+' ul li a:hover {background:'+setting.customtheme[1]+';}\n'
		+'</style>')
	}
	this.shadow.enabled=(document.all && !window.xmlhttprequest)? false : true //in ie6, always disable shadow
	jquery(document).ready(function($){ //ajax menu?
		if (typeof setting.contentsource=="object"){ //if external ajax menu
			ddsmoothmenu.getajaxmenu($, setting)
		}
		else{ //else if markup menu
			ddsmoothmenu.buildmenu($, setting)
		}
	})
}

} //end ddsmoothmenu variable

//initialize menu instance(s):
/*********************************************************************************************/
/*功能:jq插件,轻便ul li下拉菜单*/
/*********************************************************************************************/
jquery.jfastmenu = function(id){

	$(id + ' ul li').hover(function(){
		$(this).find('ul:first').animate({height:'show'}, 'fast');
	},
	function(){
		$(this).find('ul:first').animate({height:'hide', opacity:'hide'}, 'slow');
	});

}

/*********************************************************************************************/
/*功能:折叠菜单使用*/
/*********************************************************************************************/
function ulshow(vid)
{
if(document.getelementbyid("ul"+vid).style.display=="none"){
   document.getelementbyid("ul"+vid).style.display="";
   document.getelementbyid("f"+vid).src=document.getelementbyid("f"+vid).src.replace("+","-")
}
else{
   document.getelementbyid("ul"+vid).style.display="none";
   document.getelementbyid("f"+vid).src=document.getelementbyid("f"+vid).src.replace("-","+")
}
return;
}

/*********************************************************************************************/
/*功能:搜索页使用*/
/*********************************************************************************************/
function getweblist2(url,domid,pagenum){
var currentfunpath;
var susername;
var sguid;
if(typeof(videopathroot)=="undefined"){currentfunpath=""}else{currentfunpath=videopathroot}
if(typeof(videousername)=="undefined"){susername=""}else{susername=videousername}
if(typeof(videoguid)=="undefined"){sguid=""}else{sguid=videoguid}
var objectn="#"+domid;
var targeturl="http://www.51g3.com/news/remote3.0.asp?callback=?&page="+pagenum+"&pagenum="+url+"&ntimest="+math.random()+"&guid="+sguid+"&u="+susername;
 $.getjson(targeturl,function(d){
	  $(objectn).html(d.jsonobj[0]);
  });
}


function autoplay(url,pagenum){
var currentfunpath;
var susername;
var sguid;
if(typeof(videopathroot)=="undefined"){currentfunpath=""}else{currentfunpath=videopathroot}
if(typeof(videousername)=="undefined"){susername=""}else{susername=videousername}
if(typeof(videoguid)=="undefined"){sguid=""}else{sguid=videoguid}
var videobaseurl;
if (currentfunpath=="") 
{videobaseurl=currentfunpath}
else
{
if(currentfunpath.indexof('://')>=0)
{videobaseurl = currentfunpath;
}
else
{videobaseurl = 'http://'+window.location.host+'/';}
}
var targeturl=""+videobaseurl+"inc/ajaxtv.asp?callback=?&page="+pagenum+"&pagenum="+url+"&ntimest="+math.random()+"&guid="+sguid+"&u="+susername+"&action=p";
//alert('调试模式');
if (pagenum==1){
 $.getjson(targeturl,function(d){
	  player(d.jsonobj[0]);
  });
}
}



function getweblist(url,domid,pagenum){
var currentfunpath;
var susername;
var sguid;
if(typeof(videopathroot)=="undefined"){currentfunpath=""}else{currentfunpath=videopathroot}
if(typeof(videousername)=="undefined"){susername=""}else{susername=videousername}
if(typeof(videoguid)=="undefined"){sguid=""}else{sguid=videoguid}
var objectn="#"+domid;
var videobaseurl;
if (currentfunpath=="") 
{videobaseurl=currentfunpath}
else
{
if(currentfunpath.indexof('://')>=0)
{videobaseurl = currentfunpath;
}
else
{videobaseurl = 'http://'+window.location.host+'/';}
}
var targeturl=""+videobaseurl+"inc/ajaxtv.asp?callback=?&page="+pagenum+"&pagenum="+url+"&ntimest="+math.random()+"&guid="+sguid+"&u="+susername;
 $.getjson(targeturl,function(d){
	  $(objectn).html(d.jsonobj[0]);autoplay(url,pagenum)
  });
}



function player(flvname){
	//播放器 , 播放器id,宽 , 高,
	var s1 = new swfobject("video/mediaplayer.swf","player_id",tvwidth,tvheight,"7");
	s1.addparam("allowfullscreen","true");//是否允许全屏播放
	s1.addvariable("file",flvname);//单文件播放
	s1.addvariable("image","/video/preview.jpg");//背景图片
	s1.addvariable("displayheight",tvheight);//播放区域高度
	s1.addvariable("width",tvwidth);
	s1.addvariable("height",tvheight);
	s1.addvariable("backcolor","0x000000");
	s1.addvariable("frontcolor","0xcccccc");
	s1.addvariable("lightcolor","0x557722");
	s1.addvariable("enablejs","true");//是否允许javascript脚本控制flash
	s1.addvariable("javascriptid","javascript_id");//控制脚本javascriptid
	s1.write("myplayer");//将播放器写入到myplayer
 }
function g(o){return document.getelementbyid(o);} 
function hoverli(n){for(var i=1;i<=2;i++){g('tb_'+i).classname='normaltab';g('tbc_0'+i).classname='undis';}g('tbc_0'+n).classname='dis';g('tb_'+n).classname='hovertab';} 

//
//搜索ajax函数

function getajaxpage(url,keywords,perpagenum,ccid,action,pagenum){
var objectn=".indexproductinner";
var currentfunpath;
var susername;
var sguid;
if(typeof(videopathroot)=="undefined"){currentfunpath=""}else{currentfunpath=videopathroot}
if(typeof(videousername)=="undefined"){susername=""}else{susername=videousername}
if(typeof(videoguid)=="undefined"){sguid=""}else{sguid=videoguid}
var videobaseurl;
if (currentfunpath=="") 
{videobaseurl=currentfunpath}
else
{
if(currentfunpath.indexof('://')>=0)
{videobaseurl = currentfunpath;
}
else
{videobaseurl = 'http://'+window.location.host+'/';}
}
var targeturl=""+videobaseurl+"inc/ajaxsearch.asp?callback=?&action="+action+"&ccid="+ccid+"&perpagenum="+perpagenum+"&pagenum="+pagenum+"&ntimest="+math.random()+"&guid="+sguid+"&u="+susername+"&keywords="+keywords;
 $.getjson(targeturl,function(d){
	  $(objectn).html(d.jsonobj[0]);getajaxpagecomelete(objectn)
  });
}


//取得静态页参数函数
function getquerystring(querystringname)
{
var returnvalue="";
var urlstring=new string(document.location);
var serachlocation=-1;
var querystringlength=querystringname.length;
do
{
   serachlocation=urlstring.indexof(querystringname+"\=");
   if (serachlocation!=-1)
   {
    if ((urlstring.charat(serachlocation-1)=='?') || (urlstring.charat(serachlocation-1)=='&'))
    {
     urlstring=urlstring.substr(serachlocation);
     break;
    }
    urlstring=urlstring.substr(serachlocation+querystringlength+1);
   }
  
}
while (serachlocation!=-1)
if (serachlocation!=-1)
{
   var seperatorlocation=urlstring.indexof("&");
   if (seperatorlocation==-1)
   {
    returnvalue=urlstring.substr(querystringlength+1);
   }
   else
   {
    returnvalue=urlstring.substring(querystringlength+1,seperatorlocation);
   } 
}
return returnvalue;
}