Multi-Select Listbox with Check Boxes

I would like to create a multi-select list box that displays a check box to
the left of each item in the menu. The user would use the check box to
select/deselect the item rather than the standard highlight method. The
values in the list box would be dynamic based on other selections the user
has made on the form.

I'm sure this has been asked before but I could not find it...

Thanks in advance,

Jim