Web Method Or Ajax Slide Extender

I'm using visual studio 2010 and sql server 2008. I'm trying to use a web method to get urls from a database for an ajax slide extender control. I’ve been able to create a web method to call the slides and it worked. Then I wanted to create a parameter in my web method that took a parameter. I’ve been unable to get it to work with the parameter with the web method. I’m either using the wrong syntax when calling the parameter or my web method is incorrect.

This is the code for the web method with out parameter that works

Code:
<WebMethod()> _
Public Function GetSlidesDBGalEngage() As AjaxControlToolkit.Slide()
Dim connetionString As String
Dim connection As SqlConnection
Dim command As SqlCommand

[Code] ....

This is the way I calling the web method in my extender that works

HTML Code:

<cc1:SlideShowExtender ID="SlideShowExtender1" runat="server" AutoPlay="True"
ImageDescriptionLabelID="label1" NextButtonID="btnNext"
SlideShowServiceMethod="GetSlidesDBGalRecept" SlideShowServicePath="../SlideService.asmx"
PlayButtonID = "btnPlay" PreviousButtonID="btnPrev"
TargetControlID="image1">
</cc1:SlideShowExtender>

This is my web method which has a paramater

Code:
<WebMethod()> _
Public Function GetSlidesDBGalEngage(ByVal Category As String) As AjaxControlToolkit.Slide()
Dim command As SqlCommand
Dim adapter As New SqlDataAdapter

[Code] ....

This is how I'm trying to call the web method with paramater from my slide extender which doesn't work

HTML Code:
<cc1:SlideShowExtender ID="SlideShowExtender1" runat="server" AutoPlay="True"
ImageDescriptionLabelID="label1" NextButtonID="btnNext"

[B]SlideShowServiceMethod="GetSlidesDBGalParm("Other")"
[I]I've tried using both single qoutes and double quotes and notheing works[/I].[/B]
SlideShowServicePath="../SlideService.asmx"
PlayButtonID = "btnPlay" PreviousButtonID="btnPrev"
TargetControlID="image1" ClientIDMode="AutoID">
</cc1:SlideShowExtender>

Something is wrong with the syntax in the web method with the paramter or something is wrong with the way I'm calling it .