Request simple Javascript coding help

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4
Avg Bid (USD)
$123
Project Budget (USD)
$30 - $250

Project Description:
this project must be done in an hour


http://pastebin.com/pEgmz5yG

in this part i'm trying to choose a URL and picture at random when the window opens +picture+ is my attempt at a variable


return "http://www.facebook.com/connect/prompt_feed.php?preview=true&api_key=882a8490361da 98702bf97a021ddc14d&attachment={%22name%22:%20%22G edd%22,%22href%22:%20%22+keyword+%22,%22descriptio n%22:%20%22Tos!%22,%22caption%22:%20%22%22,%22medi a%22:%20[{%22type%22:%20%22image%22,%22src%22:%20%22+pictur e+%22,%22href%22:%20%22+keyword+%22}]}"

Skills required:
Javascript
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