Calculator Form

<form name=calculator action='calculator.php' method='post'>
<table border=1 cellspacing=0 cellpadding=3>
<tr><td colspan=1 align=center>
<h2>Calculator</h2>
<tr><td>
<input type=text name=num1 />
<td>
<select name=func>
		<option value=add>+</option>
		<option value=sub>-</option>
		<option value=sub>*</option>
		<option value=div>/</option>
</select>
<td>
<input type=text name=num2>
<td>
<input type=submit name=submit value='Go!'>
</table>
</form>