http referer variable

Hi,

I'm new to velocity. In my company we are using a webapp (OpenEMM - 
http://www.openemm.org) to handle our mailing campaigns and this app is 
using velocity 1.4.

We have two websites and we set a single form to subscribe to two 
different mailing-lists, one for each website... I want to use a 
different css in our form based on the http referer header.

Here what I've tried with no avail :

#set($referer = $request.getHeader('Referer')
#if($referer =="http://www.domain1.com")
   <link href="http://www.domain1.com/style.css"  media="all" rel="stylesheet" type="text/css" />
#elseif($referer =="http://www.domain2.com")
   <link href="http://www.domain2.com/style.css"  media="all" rel="stylesheet" type="text/css" />
#end

Here the output in the velocity log :

org.apache.velocity.runtime.exception.ReferenceException: reference : template = null : $referer is not a valid reference.

Any idea of what's going wrong?

Thanks,
Cedric
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