hola nuevamente y te muestro el codigo del formulario :
<?
for($i=1; $i <= $maxreg; $i++)
{
?>
<!--caracteristicas de los valores ingresados-->
<div id="div<?=$i?>" <?= ($i==1)?("style=\"display:block;\""):("style=\"dis play:none;\"") ?>>
<table width="85%" border="0" class="lightGrayCell" cellpadding="0" cellspacing="0" style="table-layout:inherit; color:#000000; border-collapse:inherit" bordercolor="#5A5A5A">
<tr height="31">
<td class="" width="3%" align="center">
<img src="cabezal/bullet_naranja2.gif" /></td>
<td width="8%"><input type="text" value="<?= $i?>"
id="np<?= $i?>" name="num_prog[]" class="blackText"
style="text-align:center;width:35%" readonly="yes" /></td>
<td width="47%"><input type="text" id="des<?= $i?>"
onblur="<?= "habPrimero($i)"?>"
onchange="checkDescripcion(<?= $i ?>)" name="descripcion[]"
style="width:95%; background:#CCCFFF; text-transform:uppercase" class="blackText"/></td><!--<?//= $i ?>-->
<td align="center" width="11%"><input type="text"
id="cant<?= $i ?>" name="cantidad[]" style="width:80%;font-size:11px; font-family:Verdana, Arial, Helvetica, sans-serif; text-align:right; background:#CCCFFF;" onkeypress="validarEnteros()"/></td>
<td width="12%"><select id="unidadM<?= $i ?>"
name="u_medida[]" style="width:80%;font-size:11px; font-family:Verdana, Arial, Helvetica, sans-serif; text-align:left; background:#CCCFFF;">
<option value="CAJAS">Cajas</option>
<option value="KILOGRAMOS">Kilogramos</option>
<option value="LATAS">Latas</option>
<option value="LITROS">Litros</option>
<option value="PIEZAS">Piezas</option>
</select></td>
<td width="9%"><?= ("<img id='bQuitar$i' src='cabezal/_Bquitar1.jpg' onclick=\"quitar($i)\" onmouseover=\"javascript
:this.src='cabezal/_Bquitar2.jpg'\" onmouseout=\"javascript
:this.src='cabezal/_Bquitar1.jpg'\" />") ?></td>
</tr>
</table>
</div>
<?
}
?>