求助关于css透明样式处理的问题?
求? 
             最近在做个层透明样式,结果出乎意料的是里面的文字也相应的淡了许多,求高手给个只要层的背景通明,但内容图片什么的保持不变的css样式.
------解决方案-------------------- <!DOCTYPE HTML PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN "  "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd ">  
  <HTML xmlns= "http://www.w3.org/1999/xhtml ">  
  <meta http-equiv= "Content-Type " content= "text/html; charset=gbk ">  
  <title> 透明 </title>  
  <head>  
  <style>    
 #popupmenu_popup { 
 color: #154BA0; 
 border: 1px solid #86B9D6; 
 background: #D9EEF9; 
 filter: Alpha(Opacity=50, Style=0);!important; 
 opacity: 0.50; 
 position: absolute; 
 z-index: 30; 
 left:300px; 
 top: 64px; 
 height: 300px; 
 width:400px; 
 }   
 #popupmenu_text { 
 color: #154BA0; 
 position: absolute; 
 z-index: 40; 
 left:301px; 
 top: 65px; 
 height: 298px; 
 width:398px; 
 text-align:center; 
 } 
  </style>  
  </head>  
  <body >    
  <div id= "popupmenu_popup ">  </div>  
  <div id= "popupmenu_text "> sssssssssssssssssssssssssssssssss </div>    
  </body>  
  </html>