VB.net WebBrowser and AJAX List Options

Question

I'm writing a VB.net program for a website that uses the AJAX Lits options http://www.ajaxdaddy.com/demo-dhtml-autocomplete.html

Whats more is that the website has used additional arguments in the function that i'm not exactly sure what they are calling, and there a trigger that executes an action that must be click, tabbing and returning fail.

Any idea on how to automate this? This website has been a holy terror since it was unleashed on my company.

I've tried this:

Dim ObjArr(4) As Object
    ObjArr(0) = CObj("prac_select")
    ObjArr(1) = CObj("'getCountriesByLetters'")
    ObjArr(2) = CObj("1")
    ObjArr(3) = CObj("'prac_name'")
    ObjArr(4) = CObj("'practice'")

    WebBrowser1.Document.InvokeScript("ajax_showOptions", ObjArr)