var showad = true;
var Toppx = 60;//上端位置
var AdDivW = 145;//宽度
var AdDivH = 300;//高度
var PageWidth = 800;//这个参数决定是否出现左右滚动条
var MinScreenW = 1024;	

var ClosebuttonHtml = '<div align="left" style="position: absolute;top:-15px;right:3px;margin:1px;padding:1px;z-index:2000;"><a href="javascript:;" onclick="hidead()" style="color:blue;text-decoration:none;font-size:10px;">关闭</a></div>';


var AdContentHtml1 = '<div align="center" style="margin-top:10px;"><a href="http://isc.org.cn/ShowArticle.php?id=15932" target=_blank><img src="/ad/2010cic.cn.jpg" width=145 height=300 border=0></a></div>';
document.write ('<div id="Javascript.LeftDiv" style="position: absolute;z-index:1000;width:'+AdDivW+'px;height:'+AdDivH+'px;top:-1000px;word-break:break-all;display:none;">'+ClosebuttonHtml+'<div>'+AdContentHtml+'</div></div>');

document.write ('<div id="Javascript.RightDiv" style="position: absolute;width:'+AdDivW+'px;height:'+AdDivH+'px;top:-1000px;word-break:break-all;display:none;">'+ClosebuttonHtml+'<div>'+AdContentHtml1+'</div></div>');
function scall(){
	if(!showad){return;}
	if (window.screen.width<MinScreenW){
		alert("临时提示：\n\n显示器分辨率宽度小于"+MinScreenW+",不显示广告");
		showad = false;
		document.getElementById("Javascript.LeftDiv").style.display="none";
		document.getElementById("Javascript.RightDiv").style.display="none";
		return;
	}
	var Borderpx = ((window.screen.width-PageWidth)/2-AdDivW)/2;

	document.getElementById("Javascript.LeftDiv").style.display="";
	document.getElementById("Javascript.LeftDiv").style.top=document.body.scrollTop+Toppx;
	document.getElementById("Javascript.LeftDiv").style.left=document.body.scrollLeft+Borderpx;
	document.getElementById("Javascript.RightDiv").style.display="";
	document.getElementById("Javascript.RightDiv").style.top=document.body.scrollTop+Toppx;
	document.getElementById("Javascript.RightDiv").style.left=document.body.scrollLeft+document.body.clientWidth-document.getElementById("Javascript.RightDiv").offsetWidth-Borderpx;
}

function hidead()
{
	showad = false;
	document.getElementById("Javascript.LeftDiv").style.display="none";
	document.getElementById("Javascript.RightDiv").style.display="none";
}
window.onscroll=scall;
window.onresize=scall;
window.onload=scall;