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I had a very large form with at least as many elements that I had a js go through and it never hung so I don't think its just that you're trying to iterate over a large number of form elements.
Doh! Welcome to WebmasterWorld!
Is an error thrown? The best way to check this is to use something like Mozilla with the JavaScript debug window open. IE will show an error icon in the bottom left of thf status bar...
This information may help us in trying to figure out the source of the problem...
HTH