漂浮广告

<script language="javascript"> var x = 50,y = 60 var xin = true, yin = true var step = 1  var delay = 10 var obj=document.getElementById("ad")  function floatAD() {  var L=T=0  //var R= document.body.clientWidth-obj.offsetWidth;  var R= document.documentElement.clientWidth-obj.offsetWidth;  var B = document.documentElement.clientHeight-obj.offsetHeight;  obj.style.left = x + document.documentElement.scrollLeft;  obj.style.top = y + document.documentElement.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)} </script>