// JavaScript Document
var iTop=140;
var isShow=true;

var left_ads=null;//document.getElementById("left_ads");
var right_ads=document.getElementById("right_ads");

var pObj=document.getElementById("top");
var bodyWidth=Math.floor(pObj.width/2);

/*
bodyWidth=pObj.width/2 为网页有效内容宽度的一半
allWidth=document.body.clientWidth/2 整个屏幕宽度的一半 120为广告的宽度 10为页面与广告之间的距离
*/

//close ads
function closeDiv()
{
	isShow=false;
}
//alert(document.documentElement.scrollTop);
function picMove()
{ 	
	var allWidth=document.body.clientWidth/2;
	//left_ads.style.left=(allWidth-(bodyWidth+110))+'px';
	right_ads.style.left= (allWidth+bodyWidth+10)+'px';
	var	diffY=document.documentElement.scrollTop;
	if(Math.floor(diffY)<iTop)
		diffY=iTop;
	if(Math.floor(diffY)>=iTop && isShow==true)
	{
		//left_ads.style.pixelTop=diffY;
		//left_ads.style.visibility='visible';
		right_ads.style.pixelTop=diffY;
		right_ads.style.visibility='visible';	
	}
	else
	{
		//left_ads.style.visibility='hidden';
		right_ads.style.visibility='hidden';
	} 
	//delete left_ads;
	delete right_ads;
}
//////////

	window.setInterval("picMove()",1);