Drop down javascript coding

Hi guys,
Need a little help,
I am trying to create a pair of drop down boxes where one relies on the other,
I go this great script from this site,

hxxp://javascript.internet.com/forms/auto-drop-down.html

The script does what I am looking for, but I need to submit it to a php script, how can I pass the value of what is selected?
Thanks for any help,
626klze

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