I'm not too familiar with the validate library for jQuery ... but I don’t see where you “hooked” on the button to “submit” the form?
I assume that you need an attribute type="submit"for your button element ... or IE7 is confused because your idis - Submitand IE has problems with elements in a form named the same as methods .. for examplesubmit()
So, try adding an attribute and / or changing the id / name.
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