图片从右至左滚动JS_图象特效

<div id="ad" style="position:absolute;width:150px;left:800;top:300"><a href=" 
" target="_blank" style="width:100%;height:100%;"><img src="http://www.google.com/intl/zh-CN/logos/holiday06_2.gif" border="0" /></a></div> 
 <script defer="defer"> 
 var x =800 
 var y=300 
 var yp=35 
 var yn=0 
 var yin=true 
 var xin = true 
 var step = 1 
 var delay = 30 
 var obj=document.getElementById("ad") 
 function floatAD() { 
 var L=-obj.offsetWidth; 
 var R= document.body.clientWidth-obj.offsetWidth 
 
 obj.style.left = x + document.body.scrollLeft 
 
 x = x + step*(xin?1:-1) 
 if (x < L) { xin = true; x = R} 
 if (x > R){ xin = false; x = R} 

 var T=0 
 var B = document.body.clientHeight-obj.offsetHeight 
 obj.style.top =y+ yn+ document.body.scrollTop 
 
 if (yin){ yn=yn+1/Math.sin(1);} 
 else{yn=yn-1/Math.sin(1);} 
 
 if (yn >yp) { yin = false } 
 if (yn <-yp) { yin = true } 


 } 
 var itl= setInterval("floatAD()", delay) 
 obj.onmouseover=function(){clearInterval(itl)} 
 obj.onmouseout=function(){itl=setInterval("floatAD()", delay)} 
 </script>

<div id="ad" style="position:absolute;width:150px;left:800;top:300"> 
<div style="position:relative;red;right:0px;top:0px;text-align:right;cursor:pointer" onClick=CloseAD()>[X]</div> 
<a href="" target="_blank" style="position:relative;left:0px;top:0px"><img width=150px src="http://www.google.com/intl/zh-CN/logos/holiday06_2.gif" border="0" /></a> 

</div> 
 <script defer="defer"> 
 var x = 800 
 var y=300 
 var yp=35 
 var yn=0 
 var yin=true 
 var xin = true 
 var step = 1 
 var delay =20 
 var obj=document.getElementById("ad") 
 var itl 
 function CloseAD(){ 
 
 clearInterval(itl); 
 obj.style.display="none"; 
 } 
 function floatAD() { 
 var L=-obj.offsetWidth; 
 var R= document.body.clientWidth-obj.offsetWidth 
 
 obj.style.left = x + document.body.scrollLeft 
 
 x = x + step*(xin?1:-1) 
 if (x < L) { xin = true; x = R} 
 if (x > R){ xin = false; x = R} 

 var T=0 
 
 obj.style.top =y+ yn+ document.body.scrollTop 
 if (x%2==0){ 
 if (yin){ yn=yn+1/Math.sin(1);} 
 else{yn=yn-1/Math.sin(1);} 
 
 if (yn >yp) { yin = false } 
 if (yn <-yp) { yin = true } 
 } 

 } 
 itl= setInterval("floatAD()", delay) 
 obj.onmouseover=function(){clearInterval(itl)} 
 obj.onmouseout=function(){itl=setInterval("floatAD()", delay)} 
 </script>