te paso el codigo completo porque aun no me sale:
<html>
<head>
<script type="text/javascript">
function enviar(frm) {
if (confirm('¿Borrar?')
frm.action='borra_noticias.php';
else
frm.action='pagina_relacion.php';
frm.submit();
}
</script>
<body>
<form method="post" name="formu_eliminar" onsubmit="enviar(this)">
<table width="670" border="1" align="center" cellpadding="2" cellspacing="2">
<tr>
<td width="41" class="Estilo1" scope="col"><div align="center">Item</div></td>
<td width="86" class="Estilo1" scope="col"><div align="center">Fecha</div></td>
<td width="438" class="Estilo1" scope="col"><div align="center">Titulo de Noticia </div></td>
<td width="69" class="Estilo1" scope="col"><div align="center">Eliminar?</div></td>
</tr>
<? include('config.php');
$consulta=mysql_query("select * from noticias order by id desc",$conectar);
$i=1;
while ($row=mysql_fetch_array($consulta))
{
?>
<tr>
<td class="Estilo2"><div align="center"><? echo $i; ?></div></td>
<td class="Estilo2"><div align="center"><? echo $row["fecha_noti"]; ?> </div></td>
<td class="Estilo2"><div align="left"> <? echo $row["desc1_noti"]; ?> </div></td>
<td class="Estilo2"><div align="center"><? echo "<input type='checkbox' name='chk_col[]' value='$row[id]'>";?></div></td>
</tr>
<? $i++; } ?>
</table><br>
<table width="300" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<th scope="col"><input type="submit" name="Submit" value="Eliminar Noticias Seleccionadas" ></th>
</tr>
</table>
</form>
</body>
</html>