filtered lookup in sharepoint

I know how to create a lookup column in sharepoint but I can't figure out how to filter it so that only certain records with a certain value in one of it's columns show up on the lookup. If I can't do this with the column itself, is it possible to at least filter what the person sees in the dropdown of the Sharepoint form?
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Are you using SharePoint 2010?
BobHavertyComhAuthor Commented:
I think you will need to use jquery then.
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BobHavertyComhAuthor Commented:
For which? To filter the values of the column or values that appear on the dropdown of the form?

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BobHavertyComhAuthor Commented:
I take it this all needs to be done in Visual Studio rather than the Sharepoint designer??
You dont actually need either you can place the code in a Content Editor Web Part (CEWP).
BobHavertyComhAuthor Commented:
I'm sure your answer was good, but I don't know jquery and the article didn't seem to be exactly what I was looking for, but at least I know what I have to learn. Thanks.
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