How can I get this submit button centered?

Check out my site at http://www.muscularchristianityonline.com/campus. I want to get the "submit" button at the top of the page centered relative to the fields to the left.

I've got my HTML below. You can find the stylesheet at http://www.muscularchristianityonline.com/stylesheet.css.

<table class="login">
		<tr>
		<td style="width:410px; height:23px; vertical-align:center;">
		<form action="student_validate_header.php" method="Post" style="display:inline; padding:0;"><input type="text" size="23" class="login" name="email" value="email">
		<input type="password" size="23" class="login" name="password" value="password">
		<input type="image" src="images/login.png" border="0" name="submit"></form></td>
		<td>
		<IMG SRC="images/spacer.gif" width="325" height="23">
		</td>
		<td background="images/spacer.gif" width="175" height="23" style="vertical-align:top;">
			<table style="padding:0px; border-spacing:0; border-collapse:collapse; background-color:#ffffff;"><form action="search.php" method="Post" style="display:inline; margin:0;">
			<tr>
			<td>
			<input type="text" name="search" size="23" value="" style='border:0px; height:18px'>
			</td>
			<td style="vertical-align:top;">
			<input type="image" src="images/search_icon.png" border="0" name="submit">
			</td>
			</tr>
			</table></form>
		</td>
		</tr>
		</table>

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