浮动广告问题
我有一段浮动广告.   
  <div   id= "ad "   style= "position:absolute ">     
  <a   href= "http://www.jobcn.com/ "   target= "_blank ">     
  <img   src= "images/ad.jpg "   border= "0 ">     
  </a>  </div>     
  <script>     
 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   B   =   document.body.clientHeight-obj.offsetHeight    
 obj.style.left   =   x   +   document.body.scrollLeft    
 obj.style.top   =   y   +   document.body.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>    
 这段放在首页里,因为首页里还有一些Flash. 
 这广告图片总是出现在Flash的下面.被遮住了.有什么办法能让这个广告图片始终位于最上面吗???
------解决方案--------------------在调用flash的代码里加: <param name= "wmode " value= "transparent "> ,然后在embed标签里加 
 wmode= "transparent ",即可覆盖flash
------解决方案--------------------1.在flash的parameters里加入  <param name= "wmode " value= "transparent ">  
 2. <body onblur=self.focus()>