Determine video URL from a web page

I want a command line/batch/console script that obtains the URL of a FLV video file. The site is [login to view URL] and seems to use Adobe's Flash Player 10. A typical video page is [login to view URL] The number suffix is the only part of the URL that changes between video pages. You will only be able to view a few videos unless you sign up. Use the promo code MG14 to get 2 weeks for free. Or I can give you a test account if needed. Your script will take the video ID as its only command line parameter and output to stdout the FLV URL. Ruby, Perl, C#, PHP, Javascript are acceptable.