classic asp / web services

The following codes are in classic asp
How can I call the function?
I tryied SendEncryption("xxx") or OnlineWS.SendEncryption(plainText) but it returns nothing. Let us assume the function is working right.

<%
Class OnlineWS

Public function SendEncryption(plainText)
            Dim objRequest, objXMLDoc
            Dim strRet, strRequest
        On Error Resume Next
        strRequest = EncryptionRequestString(plainText)
            Set objRequest = CreateObject("MSXML2.ServerXMLHTTP")
            objRequest.open "POST", m_serviceUrl , false
            objRequest.setRequestHeader "Content-Type", m_content_type
            objRequest.setRequestHeader "Content-Length",CStr(Len(strRequest))
            objRequest.setOption 2, 13056   '13065 = SXH_SERVER_CERT_IGNORE_ALL_SERVER_ERRORS to ignore certificate error
            objRequest.send strRequest
            strRet = ErrHandlerXMLHTTPRequest(objRequest, strRequest)
        set objRequest = nothing
        SendEncryption =  strRet
End function      

End Class

%>