/* 两边浮动广告 begin */

lastScrollY=0;

function initFloatAD(){ 
	var diffY;
	if (document.documentElement && document.documentElement.scrollTop){
		diffY = document.documentElement.scrollTop;
	}else if (document.body){
		diffY = document.body.scrollTop;
	}else{/*Netscape stuff*/}
    
	//alert(diffY);
	percent=.1*(diffY-lastScrollY);
	if(percent>0){
		percent=Math.ceil(percent);
	}else{
		percent=Math.floor(percent);
	}
	document.getElementById("AD_left").style.top=parseInt(document.getElementById("AD_left").style.top)+percent+"px";
	document.getElementById("AD_right").style.top=parseInt(document.getElementById("AD_right").style.top)+percent+"px";
	
	lastScrollY=lastScrollY+percent;
	//alert(lastScrollY);
}

function closeFloatAD(){
	document.getElementById("AD_left").style.visibility="hidden";
	document.getElementById("AD_right").style.visibility="hidden";
}

/*
显示首页左右浮动广告
参数: img:图片名称, url:链接, top: 广告的位置
实例: dispFloatAD("indexFloatAD.gif", "http://g.cn", 80)
*/
function dispFloatAD(img, url, top){
	AD_left	= "<DIV id='AD_left' style='width:90px;left:5px;POSITION:absolute;TOP:" + top + "px;'>" + 
				"<a href='" + url + "' target='_blank'><img border='0' src='" + img + "' /></a>" +
				"<div style='padding:2px;background-color:#F5F5F5'><a href='javascript:' onclick='closeFloatAD()'>关闭</a></div></div>";

	AD_right = "<DIV id='AD_right' style='width:90px;right:5px;POSITION:absolute;TOP:" + top + "px;'>" +
				"<a href='" + url + "' target='_blank'><img border='0' src='" + img + "' /></a>" +
				"<div style='padding:2px;background-color:#F5F5F5;text-align:right'><a href='javascript:' onclick='closeFloatAD()'>关闭</a></div></div>";
	
	document.write(AD_left);
	document.write(AD_right);
	window.setInterval("initFloatAD()", 10);
}

/* 两边浮动广告 end */