document.write("<div id=\"ad\" style=\"position:absolute\"><img border=0 src=\"images\\adfly.gif\"></div>");

var aa = 50,bb = 60;
var xin = true, yin = true;
var step = 1;
var delay = 10;
var obj=document.getElementById("ad");
function floatAD() {
	var La=Ta=0;
	var Ra= document.documentElement.clientWidth-obj.offsetWidth;
	var Ba = document.documentElement.clientHeight-obj.offsetHeight;
	obj.style.left = aa + document.documentElement.scrollLeft;
	obj.style.top = bb + document.documentElement.scrollTop;
	aa = aa + step*(xin?1:-1) 
	if (aa < La) { xin = true; aa = La;} 
	if (aa > Ra){ xin = false; aa = Ra} 
	bb = bb + step*(yin?1:-1) 
	if (bb < Ta) { yin = true; bb = Ta;} 
	if (bb > Ba) { yin = false; bb = Ba;} 
}
var itl= setInterval("floatAD()", delay) 
obj.onmouseover=function(){clearInterval(itl)} 
obj.onmouseout=function(){itl=setInterval("floatAD()", delay)}