//切换显示层，有时间缓冲
//=================计时器=================
var defaultShowLayer="div1";//默认显示层id
//=========================
var timer;
var displayLayer=defaultShowLayer;
function changeLayer(layerID){
	timer=setTimeout("showLayer('"+layerID+"')",300);
}
function showLayer(layerID){
		document.getElementById(displayLayer).style.display="none";
		document.getElementById(layerID).style.display="block";
	displayLayer=layerID;
}