asp的经典页面到php

I have this url in classic asp:"http:/blablabla/123.asp?id=1293". My question, is there a way to pass the id number to a external php script without using the form and submit, or that is only way to do it??

My data.php script:

<?php

$xxx = $_POST["xxx"];

//... some code

$gantt->render_complex_sql("SELECT * FROM gantt_tasks WHERE something = '".$xxx."'" , "id", "start_date,duration,text,progress,parent","");
?>

My "123.asp?id=1293" page:

<html>
<head>
// .. scripts and title
</head>
<body>
<form id="form1" method="post" action="data.php">
    <input type="hidden" name="xxx" value="Request.QueryString("id")" />
</form>
    <div id="gantt_here" style='width:100%; height:100%;'></div>
    <script type="text/javascript">

        gantt.init("gantt_here");
        gantt.load("data.php");

    </script>
</body>
</html>

And i dont want to use the "Response.Redirect" page either.

You can do this:

UPDATE:

gantt.load('data.php?id=<%= Request.QueryString("id") %>');

But it sounds very strange using old asp files and php files in the same project.