Affiliate Banner Generator

I am trying to build a page that my affiliates an log into an create banners to install on their websites. I can’t get it to work on my wordpress blog. I had it working on my site that I built in Dreamweaver, but I just can;t seem to figure out how to get it to work in WordPress. I need three different banner generator pages with three different banners, each pointing to different urls so I am wondering if I need a different header for each? Not sure how to do that either.

The header code is:

<?php
$user =  $_POST['user'];
$self =  $_SERVER['PHP_SELF'];

if( $user != null ) {
	setcookie( "link", $user , time() + 999999 );
	header( "Location:/membersarea/tools/memberlogogenerator.php" );
	exit();
}
?>
<?php
	$user  = $_COOKIE['link'];
	?>

The html is:

<h2 align="left">Enter Information</h2>
              <p align="left">&nbsp;</p>
              <p>1. Enter Your User Id in the form below. (Your user ID is the username you use to log into mywebsite members area)</p>
              <p> Be sure to enter the exact username you used to log in. ie; no capital letters, periods, commas, etc. </p>
              <p>&nbsp;</p>
 <p>2. Click Submit - The Page will reload and your code will be in the boxes below.</p>
 <p>&nbsp;</p>
 <p>&nbsp;</p>
 <div align="center">
 <center>
 <table border="1" cellpadding="5" cellspacing="0" style="border-collapse: collapse" bordercolor="#C0C0C0" width="90%" bgcolor="#0000cc" height="75">
 <tr>
 <td width="100%"><form action ="/membersarea/tools/memberlogogenerator.php" method = "post">

<p align="center">
<input name="user" type="text" value="" onfocus="if (this.value == '') {this.value = '';}" onblur="if (this.value == '') {this.value = '';}" size="40" tabindex="1" />
 <input type="submit" value="Submit">
</form></td>
 </tr>
 </table>
 <p>&nbsp;</p>
 <p>&nbsp;</p>
 <h2 align="left">Text Link </h2>
 <p align="left">
 <center> </p>
 <p>&nbsp;</p>
 <p align="left">
 <p align="left"><a href="http://www.mywebsite.com/<?php echo( $user ); ?>" target="_blank">Find Us As A Member Of mywebsite.com</a><br><br>

     <textarea rows="3" name="S1" cols="70"><p><a href="http://www.mywebsite.com/<?php echo( $user ); ?>" target="_blank">Find Us As A Member Of mywebsite.com</a></p>
   </textarea>
     <p><center>
 </p>
 <p>&nbsp;</p>
 <p>&nbsp;</p>
 <p>&nbsp;</p>
 <p>&nbsp;</p>
 <p align="left"><b>250 x 63 Banner </b> <br>
   <a href="http://www.mywebsite.com/<?php echo( $user ); ?>" target="_blank"><img border="0" src="http://siteimages.mywebsite.com/all-about-thisnthat-member.png" width="250" height="63"></a> </p><br>

 <center>

 <p align="left">
   <textarea rows="6" name="textarea" cols="70"><a href="http://www.mywebsite.com/<?php echo( $user ); ?>" target="_blank"><img border="0" src="http://siteimages.mywebsite.com/all-about-thisnthat-member.png" width="250" height="63" /></a></textarea>
 </p>
 </center>