代码不能在firefox中正常运行.请大虾帮改
<!DOCTYPE   html   PUBLIC    "-//W3C//DTD   XHTML   1.0   Transitional//EN "    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html   xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 "   />  
  <title> 无标题文档 </title>  
  <script   type= "text/javascript "   language= "javascript ">  
 function   show(evt){ 
 	document.getElementById( "ui ").style.top=evt.offsetY   ; 
 	document.getElementById( "ui ").style.left=evt.offsetX;	 
 	document.getElementById( "ui ").style.display= " "; 
 } 
  </script>  
  </head>  
  <body>  
  <div   id= "ui "   style= "background:#FF3300;   position:absolute;   height:100px;   width:100px;   display:none; ">  </div>  
  <p>  <span   onclick= "show(event) "> 1111111111 </span>  <br   />  
  </p>  
  <p>   </p>  
  <p>   </p>  
  <p>   </p>  
  <p>   </p>  
  <p>                 <span   onclick= "show(event) "> 1111111111 </span>  <br   />  
  </p>  
  </body>  
  </html>    
 上面代码可以在IE中正常运行.但在FIREFOX中就有问题了.我应该怎么写呢
------解决方案-------------------- <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />  
  <title> 无标题文档 </title>  
  <script type= "text/javascript " language= "javascript ">  
 function show(evt){ 
 	document.getElementById( "ui ").style.top=evt.offsetY || evt.layerY +  "px "; 
 	document.getElementById( "ui ").style.left=evt.offsetX || evt.layerX +  "px ";	 
 	document.getElementById( "ui ").style.display= " "; 
 } 
  </script>  
  </head>  
  <body>  
  <div id= "ui " style= "background:#FF3300; position:absolute; height:100px; width:100px; display:none; ">  </div>  
  <p>  <span onclick= "show(event) "> 1111111111 </span>  <br />  
  </p>  
  <p>   </p>  
  <p>   </p>  
  <p>   </p>  
  <p>   </p>  
  <p>       <span onclick= "show(event) "> 1111111111 </span>  <br />  
  </p>  
  </body>  
  </html>
------解决方案--------------------试试将 <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> 改为 
  <!DOCTYPE HTML PUBLIC  "-//W3C//DTD HTML 4.0 Transitional//EN " >