Pass form variable from one web form to another

Hi,

I have a very simple form on the frontend of a Drupal website.  The form simply asks for a users email address.  What I am trying to do is then navigate the user (when they press GO) to my 'contacts us' page with their email address already populated in the 'email address field'.

<form id="newsletterForm" action="http://mydomain/contact-us" method="POST">
	<div class="input-group">
		<input class="form-control" placeholder="Email Address" name="EmailAddress" id="EmailAddress" type="text">
		<span class="input-group-btn">
			<button class="btn btn-default" type="submit">Go!</button>
		</span>
	</div>
</form>

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Currently, with the above code, when i press GO, nothing happens.  What am i doing wrong?

Thanks