请问DIV如何实现下对齐呀?
下面是我的代码: 
 要实现左边的DIV和右边的TABLE的显示效果是一样的,   下对齐. 
 t1.css: 
 .div_main 
 { 
 	border:solid   1px   red; 
             width:102px; 
 	height:241px; 
 	background-color:#CCCCCC; 
 	vertical-align:bottom; 
 	float:left; 
 }   
 .div1 
 { 
 	height:auto; 
 	margin-bottom:0px; 
 	float:left; 
 }   
 #tb1 
 { 
 	border:solid   1px   red; 
             width:102px; 
 	height:241px; 
 	background-color:#CCCCCC; 
 	float:left; 
 }   
 #tb1   td 
 { 
 	vertical-align:bottom; 
 }   
 t1.html: 
  <!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>  
  <title> 测试 </title>  
  <meta   http-equiv= "Content-Type "   content= "text/html;   charset=GBK "   >  
  <link   href= "t1.css "   rel= "stylesheet "   type= "text/css "   >  
  </head>    
  <body>  
 	 <div   class= "div_main "   valign=bottom>  
 		 <div   class= "div1 "> abcde   abcde </div>  
 	 </div>  
 	 <table   id=tb1>  
 		 <tr>  
 			 <td   > abcde   abcde </td>  
 		 </tr>  
 	 </table>  
  </body>  
  </html>  
------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>  
  <title> 测试 </title>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=GBK " >  
  <style type= "text/css ">  
 #wrap { float:left;} 
 .div_main{ border:solid 1px red; width:204px; height:241px; background-color:#CCCCCC; vertical-align:bottom; float:left; } 
 .div1{ height:auto; margin-bottom:0px; float:left; } 
 #tb1{ border-left:solid 1px red; width:102px; height:241px; background-color:#CCCCCC; float:right; } 
 #tb1 td{ vertical-align:bottom; } 
  </style>  
  </head>  
  <body>  
 	 <div class= "div_main ">  
 		 <div class= "div1 "> abcde abcde </div>  
 	 <table id= "tb1 ">  
 		 <tr>  
 		 <td > abcde abcde </td>  
 		 </tr>  
 	 </table>  
  </div>  
  </body>  
  </html>
------解决方案--------------------如:   
  <!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>  
  <title> 测试 </title>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=GBK " >  
  <style type= "text/css ">  
 .div_main { 
  border:solid 1px red; 
  width:204px; 
  height:241px; 
  background-color:#CCCCCC; 
  float:left; 
 } 
 .div1 { 
  padding-top:220px; 
  float:left;  
 } 
 #tb1 { 
  border-left:solid 1px red; 
  width:102px; 
  height:241