Combobox question

I have a combobox in my search form that is created dynamically when the page loads, when a user hits the refresh button to get an updated results total I need to have the values they selected to stay selected. This is the code I am using

Code:

---

Dim tlist(20) As String
                Dim i As Integer
                tlist = Split(Request(name), ",")
                For i = 0 To 20
                    f.SelectedIndex = f.Items.Item(tlist(i))
                Next

---

This works great if I only select 1 item, but if I select multiple I get an error. I am using a multi select combobox and thats why I thought I would have to use an array to do it. But I get "Specified argument was out of the range of valid values. Parameter name: 601,1" when I refresh (601,1 being the values I have selected) and it highlights the "Dim tlist(20) as string" line.

Do you actually have 21 items in your list or only 20? If you have only 20, your loop should go from 0 to 19.