var currLink = "link1";
function ref(r)
{
    return typeof r=='string'? document.getElementById(r):r;
}
function toggleActive(elm)
{
    if(currLink=ref(currLink))
        removeClass(currLink,"active")
    currLink = elm;
    appendClass(currLink,"active");
}
function appendClass(elm, sClass)
{
    var currClassName = elm.className;
    if(! new RegExp("\\b"+sClass+"\\b").test(currClassName) )
        elm.className += (currClassName? ' ':'') + sClass;
}
function removeClass(elm, sClass)
{
    elm.className = elm.className
       .replace(new RegExp('\\s*'+sClass+'\\s*','g'),' ')
       .replace(/^\s+|\s+$/g,'');
}

function weather(id){
	ShowDialog('weather.asp?id='+id,'weather','506','343')
}

//ʵÏÖ´°¿Ú¾ÓÖÐ
function ShowDialog(url,wname,iWidth,iHeight) 
{ 
  var  iTop=(window.screen.height-iHeight)/2;
  var  iLeft=(window.screen.width-iWidth)/2;
  window.open(url,wname,"Scrollbars=no,Toolbar=no,menubar=no,Location=no,Direction=no,Resizeable=no,status=no,Width="+iWidth+" ,Height="+iHeight+",top="+iTop+",left="+iLeft) 
}

function divshow(){
	if(exten.style.display=='none'){
		exten.style.display='block';
		exten1.style.display='block';
	}
	else{
		exten.style.display='none';
		exten1.style.display='none';
	}
}

function divhide(){
	exten.style.display='none';
	exten1.style.display='none';
}

//使得PNG图片在IE6中透明
function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
    var arVersion = navigator.appVersion.split("MSIE")
    var version = parseFloat(arVersion[1])
    if ((version >= 5.5) && (document.body.filters)) 
    {
       for(var j=0; j<document.images.length; j++)
       {
          var img = document.images[j]
          var imgName = img.src.toUpperCase()
          if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
          {
             var imgID = (img.id) ? "id='" + img.id + "' " : ""
             var imgClass = (img.className) ? "class='" + img.className + "' " : ""
             var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
             var imgStyle = "display:inline-block;" + img.style.cssText 
             if (img.align == "left") imgStyle = "float:left;" + imgStyle
             if (img.align == "right") imgStyle = "float:right;" + imgStyle
             if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
             var strNewHTML = "<span " + imgID + imgClass + imgTitle
             + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
             + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
             + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
             img.outerHTML = strNewHTML
             j = j-1
          }
       }
    }    
}
window.attachEvent("onload", correctPNG);