select option from list box with webbrowser in vb.net 2005

[Keneda88]

Hi I am programmer with a little over a year of experience. I am trying to automate a website form but cannot change the selected item 3 different list boxes. The code I have now is:

Me.stateSelectElement = Me.classfiedsforfreebrowser.Document.GetElementById("select-state")
this collects one of the listbox elements.

From here I do not know what to do. I have tried several different techniques including setattribute and invoke member.

The web page is

http://www.classifiedsforfree.com/receiver.php/do/DisplayPostAd/f_region/City

thanks for any help
Mike