<html>
<head>
<script type="text/javascript">
function modificar() {
for (i=0; ele=document.fcalen.elements[i]; i++)
ele.disabled=false;
}
</script></head>
<body>
<form name="fcalen"><table>
<tr><td><div align='center'><input type='text' name='contrato' value='%s' size='10' disabled></div></td>
<td><div align='center'><input type='text' name='actividad' value='%s'size='10' disabled></div></td>
<td><div align='center'><input type='text' name='descripcion' value='%s' size='15' disabled></div></td>
<td><div align='center'><input type='text' name='lun' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='mar' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='mier' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='jue' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='vier' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='sab' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='text' name='dom' value='%d' size='2' disabled></div></td>
<td><div align='center'><input type='checkbox' name='aprob' value='' disabled></div></td>
</tr></table>
<button onclick="modificar()" >habilitar</button>
</body>
</html>