帮忙:如何让table里面透明,可以看到背景图片!
<!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>
       <link rel="stylesheet" href='stylemain.css' type='text/css'>
          <link rel="stylesheet" href='colors.css' type='text/css'>
             <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
             <meta http-equiv="Pragma" content="no-cache">
    <!--         <meta http-equiv="refresh" content="30">-->
             <title></title>
             <base target="_self">
             <script language="JavaScript" type="text/JavaScript">
<!--     
//-->
            </script>	    
             <style type="text/css">
alpha
{filter: Alpha(Opacity=50)}
<!--
.STYLE1 {
	font-size: 16px;
	font-weight: bold;
	color: #000000;
}
-->
             </style>
</head>
      <body>     
          <form>
          	<div align="center" id="panel_general" style="width: 728px;height: 500px;background: url(./background.jpg) repeat-x" >
          	  <table border="0" cellpadding="3" cellspacing="0" align="center" width="594">
                 <center>
                   <p align="center"> </p>
                   <tr> <br />
                       <br />
                     <br />
                     <br />
                     <br />
                     <br />
                     <br />
                     <br />
					<br />
                   </tr>		
				  <tr>				  <td> </td></tr>
                   <tr>
                     <td align="center"><div align="center" class="STYLE1">
                       <p align="center"><font>fdhdhdfhf</font></p>
                       </div></td>
                   </tr>
                   <tr>
                     <td align="center" height="6"></td>
                   </tr>                  
                   <tr>
                     <td align="center"><font class="STYLE1"><b> fdsfsdfsdfs </b></font></td>
                   </tr>
                   <tr>
                     <td align="center" height="6"></td>
                   </tr>
                   <tr> </tr>
                   <tr>
                     <td align="center"><font><b> </b></font></td>
                   </tr>
                   <tr>
                     <td align="center" height="13"></td>
                   </tr>
                   <tr> </tr>
                 </center>
        	    </table>
 &