call sub from javascript?

I have that code returns values from other there a way i can call a sub based on conditions.
that sub below has to be called if a condition in  function OnClientClose(oWnd, args) is met..

  Sub shipinvoice()
        Dim strConn2 As String = ConfigurationManager.ConnectionStrings("connectionUSSL").ConnectionString
        Dim conn2 As New SqlConnection(strConn2)
            Dim cmd2 As New Data.SqlClient.SqlCommand("wmResharpShipInvoiceCoSp", conn2)
            cmd2.CommandType = CommandType.StoredProcedure
            cmd2.Parameters.Add("@co_num", SqlDbType.NVarChar).Value = Session("coNum")
            cmd2.Parameters.Add("@PWhse", SqlDbType.NVarChar).Value = Session("coNum")
            cmd2.Parameters.Add("@infobar", SqlDbType.NVarChar, 2800).Direction = ParameterDirection.Output
            Dim dr As Data.SqlClient.SqlDataReader = Nothing
            dr = cmd2.ExecuteReader()
        Catch ex As Exception
            c1.handleError("shipinvoice", ex.Message, "")
        End Try
    End Sub
function OnClientClose(oWnd, args)
            //get the transferred arguments
            var arg = args.get_argument();
            if (arg)
                var cityName = arg.cityName;
                var seldate = arg.selDate;
                $get("order").innerHTML = "You chose to fly to <strong>" + cityName + "</strong> on <strong>" + seldate + "</strong>";

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The  way I do this is to have a hidden asp:button on the form that I can click from the java.

WiggingAuthor Commented:
could you elaborate a lil more?  
WiggingAuthor Commented:
or an example?
On the form place a hidden division, place buttons inside the division to hide them.

<div style="display:none"><asp:Button ID="Default_Action" Text="Authorize" Runat="server" OnClick="Default_Action_Click" /></div>

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then to do the postback from java
setTimeout('__doPostBack(\'Default_Action\',\'\')', 0);

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where Default action is the id of the button.

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