var x2 = 50;
var y2 = 60;
var xin2 = true;
var yin2 = true;
var step2 = 1;
var delay2 = 10;
var obj2=document.getElementById("ad2"); 
function floatAD2() {
var L2=0;
var T2=0;
var R2= document.body.clientWidth-obj2.offsetWidth;
var B2 = 520;
obj2.style.left = x2 + document.body.scrollLeft;
obj2.style.top = y2 + document.body.scrollTop;
x2 = x2 + step*(xin?2:-2); 
if (x2 < L2) { xin2 = true; x2 = L2;} 
if (x2 > R2){ xin2 = false; x2 = R2;} 
y2 = y2 + step*(yin2?2:-2); 
if (y2 < T2) { yin2 = true; y2 = T2;} 
if (y2 > B2) { yin2 = false; y2 = B2;} 
}
var itl2= setInterval("floatAD2()", delay2); 
obj2.onmouseover=function(){clearInterval(itl2);} 
obj2.onmouseout=function(){itl2=setInterval("floatAD2()", delay2);}

//