I need a Code like that:

function CTRL3_5::OnClick(eventObj)
{
    [PseudoCode]
       // I have already the DataConnections to my Webservice created
in InfoPath!
       // To Send Data is called "Absenden"
       // To Get Data is called "Abfragen"

       XDocument.DOM.selectSingleNode("//my:value").text =
Abfragen(XDocument.DOM.selectSingleNode("//my:value").text);

     Absenden();
}