How to send parameters from AutoCompleteExtender to WebService ?

Hi All,

There is a RadioButtonList over the textbox on my aspx page and users can
choice any of ListItems for search criteria. (Please check the following
image.)
http://img211.imageshack.us/img211/1600/sampleha9.png

Is it possible to send RadioButtonList1.SelectedValue to my webservice as a
parameter, over the AutoCompleteExtender.

The aspx page source is:

--------------------------------




RepeatDirection="Horizontal">
By Name
By Brand
By Country
By Type
By Model


Font-Size="14px" Height="23px">

ServicePath="search.asmx" MinimumPrefixLength="3"
ServiceMethod="GetNames" TargetControlID="TextBox1"
CompletionInterval="10" CompletionSetCount="5" UseContextKey="true"
EnableCaching="true" runat="server">

------------------------------------

Thanks in advance.

Ned