Multiple instances of FckEditor 2.6.3 (nightly) and Ajax

function getEditorValue( instanceName )
{
    // Get the editor instance that we want to interact with.
    var oEditor = FCKeditorAPI.GetInstance( instanceName ) ;
    if (!oEditor){
        alert ("No instance named: " + instanceName)
        return;
    }
    // Get the editor contents as XHTML.
    return oEditor.GetXHTML( true ) ; // "true" means you want it formatted.
}