If statement

[Serge]

Ok I have the following IF statement:

PHP Code:

if ($_GET['f'] = '57')
    {
        eval('$articlecat = "' . fetch_template('articlecat') . '";');
    }
    else
    {
        $articlecat = '';
    } 


Now this is using vbulletin 3.0 but for some reason the eval is always ran and I always get the templeat even though I only want it in some forums. Is my IF statement incorrect?

Note: In vbulletin 3.0 f is used to determine the forum id.