C'est bon j'ai trouve c'est tout con :|
<java...>
function onclick_chkbox(check_id, text_id)
{
if (check_id.checked == true)
text_id.disabled = true;
else
text_id.disabled = false;
}
</java...>
<form...>
<input type="CHECKBOX" name="IN_test" id="IN_test"
onClick="javascript:onclick_chkbox(test_form.IN_test, test_form.IN_zone_text_test);"
value="1">
<input type="CHECKBOX" name="IN_test2" id="IN_test2"
onClick="javascript:onclick_chkbox(test_form.IN_test2, test_form.IN_zone_text_test2);"
value="1">
....
</form>