Bonjour,
Tu peux t'inspirer de ça :
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr" lang="fr">
<head>
<title>Titre</title>
<meta http-equiv="Content-type" content="text/html; charset=ISO-8859-1" />
<script type="text/javascript">
function ouvreSelect(obj, cible)
{
var disabled = (obj.checked) ? '' : 'disabled';
var nb = cible.length;
var i = 0;
while (i < nb)
{
cible[i].disabled = disabled;
cible[i].selectedIndex = 0;
i ++;
}
}
</script>
</head>
<body>
<form name=test" action="" method="post">
sélectionner
<input type="checkbox" name="chk" onclick="ouvreSelect(this, this.form.elements['centre[]'])" />
Centres techniques
<select name="centre[]" disabled="disabled">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="centre[]" disabled="disabled">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="centre[]" disabled="disabled">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</form>
<table width="50%" align="center" border="0">
<tr>
<td>
</td>
</tr>
</table>
</body>
</html>