Can I cancel postback when user presses return in a textbox?

I have a `textbox` whose input is being handled by jQuery. $('input.Search').bind("keyup", updateSearchTextbox); When I press `Enter` in the textbox, I get a postback, which messes everything up. How can I trap that Enter and ignore it? (Just to preempt one possible suggestion: The textbox has to be an `` - I can't replace it with an ``.)

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