I am creating facebook fbml application, that has to run in tab. That fbml application contains image, which, after clicking, loads iframe. Iframe contains content of application and uses facebook Javascript API. Starting 23rd of August, facebook tabs are 520px wide. I am using <fb:request-form> to invite friends to application. The problem is that request form preview window is wider than 520px and doesn't fit into iframe. I can change CSS styles using firebug to make it look right, but how to do it programatically to change it permanently?