Reset Cascading dropdown value

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Ajax

Hi,
I've been googling for many days now but can't find an answer ,
I'll try to be very specific here:

1) I have 4 Cascading DropDown named (each connected to ajaxToolkit:CascadingDropDown extender)
2) The dropdowns are named in the following order (asp code below )
ddlCatalogueName > ddlMainGroup > ddlSubGroup > ddlPageNumbers ,

3)ddlPageNumbers is child of ddlSubGroup , and ddlPageNumbers contains items always starting from 1 and then upto number of pages (ex. 1/2/3 or 1/2/3/4 or only 1)

4) After selecting a ddlPageNumbers item, when i want to move to another Subgroup (ddlSubGroup) ,ddlPageNumbers doesn't revert back to 1 , it stays the same (2-3-4 whatever i previously chose)

I need a way to reset ddlPageNumbers , when another ddlSubGroup is selected.
A working example can be seen at :

www.turkeyautospareparts.com/catalogue.aspx


I am open to all suggestions.

Thanks in avance to everybody.

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------------RELATED .aspx code --------------<br />
<br />
<pre>
<asp:DropDownList ID="ddlCatalogueName" runat="server" Width="180px" AutoPostBack="true" />
<br />
<asp:DropDownList ID="ddlMainGroup" runat="server" Width="180px" AutoPostBack="true" />
<br />
<asp:DropDownList ID="ddlSubGroup" runat="server" Width="180px" AutoPostBack="true" />
<br />
<asp:DropDownList ID="ddlPageNumbers" runat="server" Width="60px" AutoPostBack="true" />
<br />

<ajaxToolkit:CascadingDropDown ID="cddCatalogueName" runat="server" TargetControlID="ddlCatalogueName" Category="CatalogueName" PromptText="Choose a Catalogue..." LoadingText="Please wait ..." ServicePath="Catalogue.asmx"
ServiceMethod="GetCatalogueName">
</ajaxToolkit:CascadingDropDown>

 <ajaxToolkit:CascadingDropDown ID="cddMainGroup"  runat="server" TargetControlID="ddlMainGroup"  ParentControlID="ddlCatalogueName"  Category="MainGroup" PromptText="Choose a Group..."   LoadingText="Please wait ..."   ServicePath="Catalogue.asmx"  ServiceMethod="GetMainGroup" >
 </ajaxToolkit:CascadingDropDown>

 <ajaxToolkit:CascadingDropDown ID="cddSubGroup"  runat="server" TargetControlID="ddlSubGroup"  ParentControlID="ddlMainGroup"  Category="SubGroup"  PromptText="Choose a Sub Group..."  LoadingText="Please wait ..."  ServicePath="Catalogue.asmx"  ServiceMethod="GetSubGroup" >
 </ajaxToolkit:CascadingDropDown>

 <ajaxToolkit:CascadingDropDown ID="cddPageNumbers"  runat="server" TargetControlID="ddlPageNumbers"  ParentControlID="ddlSubGroup"  Category="Pages"  LoadingText="Please wait ..."  ServicePath="Catalogue.asmx"  ServiceMethod="GetPageNumbers" SelectedValue="1"  >
 </ajaxToolkit:CascadingDropDown>
</pre><br />
------------ END OFRELATED .aspx code --------------