var x3 = 50;
var y3 = 60;
var xin3 = true;
var yin3 = true;
var step3 = 1;
var delay3 = 10;
var obj3=document.getElementById("ad3"); 
function floatAD3() {
var L3=0;
var T3=0;
var R3= document.body.clientWidth-obj3.offsetWidth;
var B3 = 620;
obj3.style.left = x3 + document.body.scrollLeft;
obj3.style.top = y3 + document.body.scrollTop;
x3 = x3 + step*(xin?3:-3); 
if (x3 < L3) { xin3 = true; x3 = L3;} 
if (x3 > R3){ xin3 = false; x3 = R3;} 
y3 = y3 + step*(yin3?3:-3); 
if (y3 < T3) { yin3 = true; y3 = T3;} 
if (y3 > B3) { yin3 = false; y3 = B3;} 
}
var itl3= setInterval("floatAD3()", delay3); 
obj3.onmouseover=function(){clearInterval(itl3);} 
obj3.onmouseout=function(){itl3=setInterval("floatAD3()", delay3);}

//