// JavaScript Document

//获取ID
function Y(al)
{
	    return eval('document.getElementById("'+al+'")');		
}
//改变样式
function ChangClass(uid,css,num)
{   
    var tabList = document.getElementById(uid).getElementsByTagName("li");    
    for(i=0; i<tabList.length; i++)
    {    
      if (i==num )
      {
        tabList[i].className =css;
		var obj= document.getElementById("subNav"+i+"");
        if(obj)
          obj.style.display="block";

      }
      else
      {
          tabList[i].className ="none"; 
          var obj= document.getElementById("subNav"+i+"");
          if(obj)
             obj.style.display="none";

       }
    } 

}