var whichhide ;
var whichshow ;
function getid(obj)//取对应id的元素
	{
		return document.getElementById(obj);
	}

function getNames(obj,name,tij)
	{	
		var plist = obj.getElementsByTagName(tij);
		var rlist = new Array();
		for(i=0;i<plist.length;i++)
		{
			if(plist[i].getAttribute("name") == name)
			{
				rlist[rlist.length] = plist[i];
			}
		}
		return rlist;
	}
function getDisplay(obj)
	{
		for(i=0;i<obj.length;i++)
		{
			if(obj[i].style.display=="block")
			{
				break ;				
			}
		}
		return i;
	}
function showhide(parent,who,which)
	{
		if (window.runing) clearInterval(runing);
		var aa = getid(parent);
		var bb = getNames(aa,who,"div");
		var cc = getDisplay(bb);
		if(cc==which){return false;}
		whichhide = bb[cc];
		whichshow = bb[which];
		whichshow.style.display = "block";
		//whichshow.className = "bianhuan";
		//oRect = bb[cc].getBoundingClientRect().top-bb.length;
		//whichshow.style.top = oRect;
		//whichshow.filters.alpha.opacity = 0;
		//whichhide.filters.alpha.opacity = 100 ;		
		//runing = setInterval("play()",40);
		whichhide.style.display = "none";
		whichshow.style.display = "block";	
	}