Postback on 'Return' Problem

Hi everyone,

I have a page consisting of a navigation bar with a search box. The search textbox has a submit button to send a search for the inputted text. Currently, when the user hits 'Return' from inside of the search TextBox, the page simply posts back to itself. I need some way to automate clicking the 'submit' button when the user hits 'Return' and the search box has focus. Checking for the presence of text within the search field with each postback is not a good solution with my present scenario. Does anyone have any suggestions or help that they could provide? Thanks!

-Chris