ie4=(document.all)?true:false;
ns4=(document.layers)?true:false;

function toExit(){
var args=toExit.arguments;
var visible=args[0];
if(ns4){
		theObj=eval("document.layers[\'"+args[1]+"\']");
		if(theObj)theObj.visibility=visible;
		}
else if(ie4){
		if(visible=='show')visible='visible';
		if(visible=='hide')visible='hidden';
		theObj=eval("document.all[\'"+args[1]+"\']");
		if(theObj)theObj.style.visibility=visible;
		}

}     




<!--
//more javascript from http://www.smallrain.net
function initEcAd() {
document.all.AdLayer1.style.posTop = -50;
document.all.AdLayer1.style.visibility = 'visible'
document.all.AdLayer2.style.posTop = -50;
document.all.AdLayer2.style.visibility = 'visible'
MoveLeftLayer('AdLayer1');
MoveRightLayer('AdLayer2');
}
function MoveLeftLayer(layerName) {
var x = 0;
var y = 50;
var diff = (document.body.scrollTop + y - document.all.AdLayer1.style.posTop)*.20;
var y = document.body.scrollTop + y - diff;
eval("document.all." + layerName + ".style.posTop = parseInt(y)");
eval("document.all." + layerName + ".style.posLeft = x");
setTimeout("MoveLeftLayer('AdLayer1');", 20);
}
function MoveRightLayer(layerName) {
var x = 0;
var y =220;
var diff = (document.body.scrollTop + y - document.all.AdLayer2.style.posTop)*.40;
var y = document.body.scrollTop + y - diff;
eval("document.all." + layerName + ".style.posTop = y");
eval("document.all." + layerName + ".style.posRight = x");
setTimeout("MoveRightLayer('AdLayer2');", 20);
}

document.write("<div id=AdLayer1 style='position: absolute;visibility:hidden;z-index:1'><a href=javascript:toExit('hide','AdLayer1')><br><font size=6></font></a></div>"
	+"<div id=AdLayer2 style='position: absolute;visibility:hidden;z-index:1'><br><a href=df/gbook/index.asp target=_blank><img src=pic/zengshu.jpg quality=high border=0></a><a href=javascript:toExit('hide','AdLayer2')><br><font size=6></font></a></div>");
initEcAd()
//-->