Exporting variable from plugin to template

[saveriop]

Hi,
I need just to make available a new variable in my template.
If the requested url contains a custom value (a referral index), I need to add this value to profiles url.

I'm new to vbulletin programming; I need to do something like:

if ($_GET['fref']=='PS') $_SESSION['fref']='PS';

$pfer ? $_SESSION['fref'];

Then I would like to use $pref insede the template.