表格自动排序问题,如何用javascript实现,谢谢
以下为测试表格,我想在页面显示的时候,以第三列为准,降序显示,怎么用javascript实现??   
  <html>  
  <head>  
              <title> tree </title>  
              <meta   name= "designer "   content= "csdn   design   team   -   meizz "   />  
  </head>  
  <style>  
 body{ 
 	FONT-SIZE:   9pt;   PADDING-RIGHT:   0px;   PADDING-LEFT:   0px;   PADDING-BOTTOM:   0px;   PADDING-TOP:   0px; 
 } 
 input   { 
 	FONT-SIZE:   9pt;   height:   15pt;   width:50px;   cursor:   default; 
 } 
 table{ 
 	font-size:   9pt; 
 	word-break:break-all; 
 	cursor:   default; 
 	BORDER:   black   1px   solid; 
 	background-color:#eeeecc; 
 	border-collapse:collapse; 
 	border-Color:#999999; 
 	align:center; 
 } 
  </style>  
  <body>  
  <form   name= "frm1 "   method= "post "   action= "/addcontent.jsp ">  
  <table   width= "60% "   border= "0 "   cellspacing= "0 "   cellpadding= "0 "   align= "center ">  
        <tr>  
              <td   width= "24% "   align= "center ">  <input   type= "checkbox "   name= "id "   value= "15 ">  </td>  
              <td   width= "56% "> 后台数据库编程 </td>  
              <td   width= "20% "> 0 </td>  
        </tr>  
        <tr>  
              <td   width= "24% "   align= "center ">  <input   type= "checkbox "   name= "id "   value= "3 ">  </td>  
              <td   width= "56% "> 用户体验综合版 </td>  
              <td   width= "20% "> 3 </td>  
        </tr>  
        <tr>  
              <td   width= "24% "   align= "center ">  <input   type= "checkbox "   name= "id "   value= "7 ">  </td>  
              <td   width= "56% "> 英语学习和技术翻译 </td>  
              <td   width= "20% "> 1 </td>  
        </tr>  
  </table>  
  </form>  
  </body>  
  </html>  
------解决方案-------------------- <html>  
  <head>  
      <title> tree </title>  
      <meta name= "designer " content= " " />  
  </head>  
  <style>  
 body{ 
 FONT-SIZE: 9pt; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; 
 } 
 input { 
 FONT-SIZE: 9pt; height: 15pt; width:50px; cursor: default; 
 } 
 table{ 
 font-size: 9pt; 
 word-break:break-all; 
 cursor: default; 
 BORDER: black 1px solid; 
 background-color:#eeeecc; 
 border-collapse:collapse; 
 border-Color:#999999; 
 align:center; 
 } 
  </style>  
  <script type=text/javascript>  
 function sortTable(tableid, col) 
 { 
 	var table = document.getElementById(tableid); 
 	for (var i = 0; i  < ta