//浮动广告
function setFloatAds(id) {
	
	var obj	= document.getElementById(id);
	var dis	= getTop(obj);
	var left = getLeft(obj);
	var s_height = document.body.scrollHeight;
	///*
	if (!document.getElementById(id+"_bak")) {
		var raw_obj = document.getElementById(id);
		var obj_bak = document.createElement("div");
			obj_bak.id = id+"_bak";
			obj_bak.style.cssText = "float:left;width:"+raw_obj.offsetWidth+"px;height:15px;";	

			raw_obj.parentNode.insertBefore(obj_bak,raw_obj);
	}
	//*/


	var raw = 0;
	if (obj.getAttribute("top") == null) {
		obj.setAttribute("top",dis);
		obj.setAttribute("left",left);
		obj.setAttribute("s_height",s_height);	
		raw = dis;
	}
	obj.style.position = 'absolute';
	obj.style.zIndex = "0";
	raw = obj.getAttribute("top");
	if (document.documentElement && document.documentElement.scrollTop) {
		var top  = document.documentElement.scrollTop;
	}else if (document.body) {
		var top  = document.body.scrollTop;
	}
	top = parseInt(top);
	raw = parseInt(raw);
	if (top > raw) {
		var diff = (top-raw);
		if (parseInt(top+obj.offsetHeight) < (s_height-120)) {
			var tmp = parseInt(s_height)- parseInt(top+obj.offsetHeight);
			if (tmp < 118) {
				top = top-120;
			}
			obj.style.top = top+"px";
			obj.style.left = obj.getAttribute("left")+"px";
		}
	} else {
		obj.style.top = obj.getAttribute('top')+"px";
		obj.style.left = obj.getAttribute("left")+"px";
	}
}


function getTop(e) {
	var offset=e.offsetTop;
	if(e.offsetParent!=null) offset+=getTop(e.offsetParent);
	return offset;
}

function getLeft(e) {
	var offset=e.offsetLeft;
	if(e.offsetParent!=null) offset+=getLeft(e.offsetParent);
	return offset;
}