function inputAutoClear(ipt){if(ipt.value==ipt.defaultValue){ipt.value='';}ipt.onfocus=null;
setTimeout(function(){ipt.onfocus=function(){if(this.value==this.defaultValue){this.value='';}};ipt.onblur=function(){if(this.value==''){this.value=this.defaultValue;}};},0);}
<!--png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);

<!--动态新闻滑动代码-->
function tabchange(obj,id)
{
 var arrayli = obj.parentNode.getElementsByTagName("li"); //获取li数组
 var arrayul = document.getElementById(id).getElementsByTagName("ul"); //获取ul数组
 for(i=0;i<arrayul.length;i++)
 {
  if(obj==arrayli[i])
  {
   arrayli[i].className = "cli";
   arrayul[i].className = "";
  }
  else
  {
   arrayli[i].className = "";
   arrayul[i].className = "hidden";
  }
 }
}
<!--政务公开滑动代码-->
function tabchange1(obj,id)
{
 var arrayli = obj.parentNode.getElementsByTagName("li"); //获取li数组
 var arrayul = document.getElementById(id).getElementsByTagName("ul"); //获取ul数组
 for(i=0;i<arrayul.length;i++)
 {
  if(obj==arrayli[i])
  {
   arrayli[i].className = "cli1";
   arrayul[i].className = "";
  }
  else
  {
   arrayli[i].className = "";
   arrayul[i].className = "hidden1";
  }
 }
}
<!--市政府常务会议、市政府领导活动滑动代码-->
function tabchange2(obj,id)
{
 var arrayli = obj.parentNode.getElementsByTagName("li"); //获取li数组
 var arrayul = document.getElementById(id).getElementsByTagName("ul"); //获取ul数组
 for(i=0;i<arrayul.length;i++)
 {
  if(obj==arrayli[i])
  {
   arrayli[i].className = "cli2";
   arrayul[i].className = "";
  }
  else
  {
   arrayli[i].className = "";
   arrayul[i].className = "hidden2";
  }
 }
}