Keby si si celu tabulky hodil do form, nemusel by si riesit podobne veci takto krkolomne

<form name="form_a" method="post">
	<table border="1" cellpadding="0" cellspacing="0"> 	
		<tr>    
			<td align="right">      
					<input type="text" name="text_a">        
					<input type="submit" name="submit_a" value="value">      
			</td>  
		</tr>
	</table>
</form>