Send a variable to a page that is frame source

I have a page that shows every contract from a table in my MySQL-database. Now you can select the contract and you have to get the rest of the contractdata. The problem is, that this contractnumber must go to one of three frames. Does anybody know how to do this? Maybe I need JavaScript or something???
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<a href="details.php?contract=<?php echo $contract_number; ?>" target="frame3">

details.php opens in the third frame and the variable contract is passed to it. It is then accessed using $_GET['contract']

should be as simple as that

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