Usar - em inves de _ javascrpit

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como faço pra usar - ao inves de _ nessa parte do codigo

one0 = document.autoSumForm.materialcopiasitens_0_item_qtoriginais.value;

one0 = document.autoSumForm.materialcopiasitens-0-item_qtoriginais.value;

	<table width="50%" border="1">
		<form name="autoSumForm" method="post" action="carrinho_padrao/acao_padrao2.php" enctype="multipart/form-data">
			<tr>
			<td width="1%" class="courier_tab">Ítem</td>
			<td width="1%" class="courier_tab">Qtd.</td>
			<td width="5%" class="courier_tab">Valor.</td>
			<td width="5%" class="courier_tab">Sub. Total</td>
			</tr>
			<?php
			 for ($z=0; $z<= 2; $z++){
			 ?>
			<tr>
			<td width="%" class="courier_tab" align="center"> <?php echo ''.$z+1;?></td>

			<td width="1%" class="courier_tab"><input type="text" name="materialcopiasitens_<?php echo $z;?>_item_qtoriginais" value="" onFocus="startCalc();" onBlur="stopCalc();"></td>

			<td width="1%" class="courier_tab"><input type="text" name="materialcopiasitens<?php echo $z;?>item_qtexemplares" value="" onKeyUp="Mascara(this,Area)" onFocus="startCalc();" onBlur="stopCalc();""></td>

			<td width="1%" class="courier_tab"><input type="text" name="materialcopiasitens<?php echo $z;?>item_qtecopias" value=""></td>
			</tr>
			<?php
			}
			?>
			 <tr>
			 <td align="right" class="courier_tab" colspan="11" class="courier_tab">Total
			 <input class="right" type=text  name="thirdTot" size="8" value=""></td>
			 </tr>
		</form>
	</table>