function doshow()
{
	var layerMenu=document.getElementById("Layer1");
	if(layerMenu.style.visibility=="hidden")
	{
		layerMenu.style.visibility="visible";	
//		aMenu.innerText="请单击这里关闭下载栏目";
	}
	else
	{
		layerMenu.style.visibility="hidden";	
//		aMenu.innerText="请单击这里打开下载栏目";	
	}
}

function dohide()
{
//	var layerMenu=document.getElementById("Layer1");
	Layer1.style.visibility="hidden";
	aMenu.innerText="请单击这里打开下载栏目";
		
}

function showWhichDiv(div1,divall)
{
	var iCount=parseInt(divall);
	for(i=1;i<=iCount;i++)
	{
		eval("divDown" + i + ".style.display='none'" );
	//	divId.style.display="none";
	}
	eval("divDown" + div1 + ".style.display='block'");
//	divIt.style.display="block";
}