一个关于表格边框的问题!紧急求救!
我设置了一个单元格的背景色。 
 显示出来是一个四四方方的红色的表格。 
 但是我想要的效果是显示出来的是圆角矩形。就是说四个角要有点弧度的,请问如何设定?
------解决方案-------------------- <!DOCTYPE HTML PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN "  "http://www.w3.org/TR/html4/loose.dtd ">  
  <html>  
  <head>  
  <style type= "text/css ">  
 div#nifty{margin: 0 10%;background: #9BD1FA} 
 b.rtop, b.rbottom{display:block;background: #FFF} 
 b.rtop b, b.rbottom b{display:block;height: 1px; overflow: hidden; background: #9BD1FA} 
 b.r1{margin:0 5px} 
 b.r2{margin:0 3px} 
 b.r3{margin:0 2px} 
 b.rtop b.r4, b.rbottom b.r4{margin:0 1px;height:2px} 
  </style>  
  </head>  
  <body>  
  <div id= "nifty ">  
    <b class= "rtop ">  <b class= "r1 ">  </b>  <b class= "r2 ">  </b>  <b class= "r3 ">  </b>  <b class= "r4 ">  </b>  </b>  
      <h1> Nifty Corners </h1>  
      <p> Auiiui uieiouo auuaa oiaue uaou iioiiou uiio a io ieeoai uaouoe uoiaau eeauauou u oiauuie eo ui. </p>  
      <h2> Rounded corners without images </h2>  
      <p> Aaeao aiieuouiu io ueuiieu uei oeio uooiau uue ooiea ooiaui eue ouue i uiaoo iouieiuia uueeo ieieuiiau 
     ueaooa iou iaeieuo uoao iauoi u i oeioooe auo a ooe u uuuo oaooaae uoa iuiuiaeu iioaeu uuiu eeu ea eouoiuo ua o. </p>  
    <b class= "rbottom ">  <b class= "r4 ">  </b>  <b class= "r3 ">  </b>  <b class= "r2 ">  </b>  <b class= "r1 ">  </b>  </b>  
  </div>  
  </html>  
------解决方案-------------------- <html>  
  <head>  
  <title> css圆角效果--七度空间网页教学网 </title>  
  <meta http-equiv= "content-type " content= "text/html; charset=gb2312 ">  
  <style type= "text/css ">  
 div.RoundedCorner{display:inline;background: #9BD1FA;width:200px;text-align:center} 
 b.rtop, b.rbottom{display:block;background: #FFF} 
 b.rtop b, b.rbottom b{display:block;height: 1px;overflow: hidden; background: #9BD1FA} 
 b.r1{margin: 0 5px} 
 b.r2{margin: 0 3px} 
 b.r3{margin: 0 2px} 
 b.rtop b.r4, b.rbottom b.r4{margin: 0 1px;height: 2px} 
  </style>  
  </head>  
  <body>  
  <div class= "RoundedCorner ">  
  <b class= "rtop ">  <b class= "r1 ">  </b>  <b class= "r2 ">  </b>  <b class= "r3 ">  </b>  <b class= "r4 ">  </b>  </b>  
  <br> 你要的是这样的吗? <br>  <br>  
  <b class= "rbottom ">  <b class= "r4 ">  </b>  <b class= "r3 ">  </b>  <b class= "r2 ">  </b>  <b class= "r1 ">  </b>  </b>  
  </div>  
  </body>  
  </html>
------解决方案--------------------http://blog.csdn.net/uno   
 我写过一篇,只用HTML+CSS,不需要图片   
 技术是从gtalk的样式列表里偷出来的:P