How to Populate Ajax-Autocomplete Extender using javascript

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ASP.NET

Javascript

Ajax

I have an auto complete extender . I am populating it using Web method
//------------------------------------------------------------------
<asp:TextBox ID="txtTestCode" runat="server">

<cc1:AutoCompleteExtender ID="AutoCompleteExtenderDemo" runat="server"
            TargetControlID="txtTestCode" ServiceMethod="GetCompletionList"
            MinimumPrefixLength="1" CompletionInterval="1000"
            EnableCaching="true" CompletionSetCount="5">
        </cc1:AutoCompleteExtender>

/---------------------------------------------------------------------

[System.Web.Services.WebMethod]
       public static string[] GetSuggestions(String prefixText, int count)
       {
           string[] movies = { "RGL", "CYT", "SPL", "URN", "HEM", "BIO", "STL" };

           ArrayList filteredList = new ArrayList();

           foreach (string s in movies)
          {
              if (s.ToLower().StartsWith(prefixText.ToLower()))
              filteredList.Add(s);
          }
          return (string[])filteredList.ToArray(typeof(string));
       }

       [System.Web.Services.WebMethod]
       public static string[] GetCompletionList(String prefixText, int count)
       {
           string[] suggetions = GetSuggestions(prefixText, count);
           return suggetions;
       }

//--------------------------------------------------------------------

Is there any way to populate it at clientside using javascript