Making a Searchable Dropdown box

I have a dropdown box on a web form that lists all of the clients for my form to help create routing forms. The code is:

<% RsList.Source = "select * from tblClients;" RSList.Open If Not RSList.EOF Then RSList.MoveFirst %>
Select the Client:
<% Do While Not rslist.EOF %>“><%= rslist.Fields("clientnumber") & " " & rslist.fields("name")%><% rslist.MoveNext Loop End If rslist.close %>

Since we have 2500 clients, this creates a rather long list. What I would like to do is make this list searchable, by allowing users to start typing in the client name and having the list jump to that client. Is there a way to do this in VBscript and ASP?