Why does this not work?

[strugglingon]

I added the following to a frameof a webpage with the intention of using a button to run the function, unfortunately it dos not work. I know the function works when fun from a file on its own, but does not seem to work with the buttons, any ideas?

<form action ="<?php $PHP_SELF;?>" method ="post">
<input type="submit" name="Submit" value="Serialise Links" >
<?php
include "fetch.class.php";
$spider=new fetchlinks("http://www.anysite.com");
$spider->show_href(1);
?>

If it helps i can explain what fetch.class is supposed to do, or give you the source code.

[Michael2004]

If you only want to execute a function if a submit function has been pressed you can try something like this:

<?php

if(isset($_POST['inputName']))
{
  // Code to execute
}

?>

[strugglingon]

I see. Thanks that works, but now i need to replace the URL in:

$spider=new fetchlinks("http://www.anysite.com");

with the url of a page that has been browsed to in my frame named "main"

This brings me to the same problem that i have experienced with other buttons that are getting currently displayed URLs from other frames. Any ideas?