//¸¡¶¯¹ã¸æ
var x =0,y =0 
var xin = true, yin = true 
var step = 1 
var delay = 50
var obj=document.getElementById("ad")

function floatAD() { 
	var L=T=0 
	var R= document.body.clientWidth-obj.offsetWidth 
	var B = document.body.clientHeight-obj.offsetHeight 
	obj.style.left = x + document.body.scrollLeft
	obj.style.top = y + document.body.scrollTop
	
	x = x + step*(xin?1:-1) 
	if (x < L) { xin = true; x = L} 
	if (x > R){ xin = false; x = R} 
	y = y + step*(yin?1:-1) 
	if (y < T) { yin = true; y = T } 
	if (y > B) { yin = false; y = B }
} 
var itl= setInterval("floatAD()", delay) 
obj.onmouseover=function(){clearInterval(itl)} 
obj.onmouseout=function(){itl=setInterval("floatAD()", delay)}

function clos(){
	clearInterval(itl);
	obj.style.display="none";
}

var objLf=document.getElementById("adLf")
var objRt=document.getElementById("adRt")
function scrol(){   
	objLf.style.top = objRt.style.top = 150 + document.body.scrollTop;
}