Código HTML:
<html>
<head>
<title></title>
<script>
function algo(bot) {
do bot = bot.parentNode
while (bot.tagName != 'TR')
for(i=0; ele = bot.getElementsByTagName('input')[i]; i++)
ele.readOnly = false;
}
</script>
</head>
<body>
<table border="1">
<tr>
<td>id</td>
<td>nº Matricula</td>
<td>Alumno</td>
<td>sol 1</td>
<td>sol 2</td>
<td>ctrl 1</td>
<td>ctrl 2</td>
<td>ctrl 3</td>
<td>ctrl 4</td>
<td>Examen</td>
<td>Final</td>
</tr>
<? foreach ($datos as $us)
{?>
<tr>
<td align="center"><?=$us['id'];?></td>
<td align="center"><?=$us['n_matricula'];?></td>
<td align="center"><?=$us['alumno_nom'];?> <?$us['alumno_nom'];?></td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['sol1'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['sol2'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['ctrl1'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['ctrl2'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['ctrl3'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['ctrl4'];?>"</td>
<td align="center"><input type="text" size="1" readonly="readonly" value="<?=$us['examen'];?>"</td>
<td align="center"><?=promedio($us['sol1'], $us['sol2'], $us['ctrl1'], $us['ctrl2'], $us['ctrl3'], $us['ctrl4'], $us['examen']);?></td>
<td align="center"><input type="button" name="Editar" value="Editar" onclick="habilitar()"></td>
</tr>
<? } ?>
</table>
</body>
</html> el problema es ke al apretar el boton editar deberian habilitarse los input text para escritura, pero al ahcerlo no sucede nada, todos los input text siguen iguales