Clear all optgroups and options from a select list

I have a multiple select list that is created dynamically based on a
previous selection on an asp page. The first thing I do is to clear
the curent option list by

document.form1.itemcross.length = 0;

The only problem is that it leaves the optgroups. How do I also get
rid of the optgroups?

Thanks
BrianD

.

Relevant Pages