Accessing master page control from content page through javascript

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.NET3.5

Javascript

.NET

Hi All,

Could somebody please tell me how do i access the master page control in content page through javascript?

I have got some code as follows.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
            Dim tb As TextBox = CType(Master.FindControl("txtMaster"), TextBox)
            Dim val As String = tb.ClientID
            Dim script As String = "<script>" & ControlChars.CrLf & "        function PopulateMaster() {" & ControlChars.CrLf & "            document.getElementById('" & val & "').value = 'Via Content Page.;                " & ControlChars.CrLf & "        }" & ControlChars.CrLf & "        PopulateMaster();" & ControlChars.CrLf & "        </script>"
            If (Not Page.ClientScript.IsStartupScriptRegistered("Mast")) Then
                  Page.ClientScript.RegisterStartupScript(Me.GetType(), "Mast", script)
            End If
 
   End Sub

The problem here is I do not want to call the javascript from code behind, I want to call it from aspx page and i want to change the text of a label placed in master page, based on some clicks in client side in content page.

Could somebody help me!!

Best Regards,
Snigdha