[jQuery] Select all items in list on form submit

Hi all,

I wonder if anyone can help. I have this bit of code that selects all
the items in a multiselect list box when the form is submitted.

$('#assignUsersForm').submit(function() {
$('#assignedUserList option').each(function(i) {
$(this).attr("selected", "selected");
});
});

It works perfectly in IE8, FF, safari and chrome but not IE7 & 6

Does anyone have any idea why or can anyone suggest alternative code.

Thanks, Richard