how about a client-side script that checks for image tags or common web image extensions (jpg, gif, png, etc). If these are missing then return an error/reminder page of the rules and ask them to try again.
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i5 2500K @ 4.0 GHz
2 x 4GB G.Skill Ripjaws X
Patriot Pyro 240GB
Gigabyte HD 6970 OC
Gigabyte Z68X-UDH3-B3
Seasonic 760W
Coolermaster Hyper 212+
CM690 w/ 1-80mm, 6-120mm fans.
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