我想通过点击来实现下载： <a href="down.php?id= <? echo $id?>" target="_blank">下载 </a>
down.php全代码如下(网上查来的)：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title> </title>
</head>
<body>
<?php
$id=$_GET['id'];
$SQL="select * from filedown where id=".$id;
$rs=mssql_query($SQL,$sqlLink);
list($id,$title,$puttime,$fileurl,$filesrc)=mssql_fetch_row($rs);
$filedownUrl = $fileurl.$filesrc;
if(strpos($filedownUrl, 'http://') !== false || strpos($filedownUrl, 'ftp://') !== false) {
header("Location: $filedownUrl");
exit();
}else {
$filename = basename($filedownUrl); //取文件名
$pathinfo = pathinfo($filename);
$filetype = $pathinfo['extension']; //取得扩展名
$filesize = filesize($filedownUrl);
if(ob_get_length() !== false) @ob_end_clean(); //清除以前的缓冲
header('Pragma: public');
header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no
<!--购买数量-->
<div class='buyinfo'>
<table width='auto'>
<tr>
<td><span>购买数量：</sp ......
