function paypalAction( action, onload, callback)
{
    var url = null;
    if ( action.indexOf( 'http') >= 0) {
        url = action;
    } else {
        url = '/paypal-' + action + '.html';
    }
    if ( typeof( PAYPALwindow) == 'window') {
        PAYPALwindow.location.href = url;
    } else {
        PAYPALwindow = window.open( url, 'PAYPAL', 'height=900,menubar=no,scrollbars=yes,width=1100,location=no,status=no');
    }
    if ( onload) {
        PAYPALwindow.onload = onload;
    }
    if ( callback) {
        PAYPALwindow_callback = callback;
        if ( typeof( PAYPALwindowTimer) != 'undefined') {
            window.clearInterval( PAYPALwindowTimer);
            delete PAYPALwindowTimer;
        }
        PAYPALwindowTimer = window.setInterval( function() {
            if ( PAYPALwindow.closed) {
                window.clearInterval( PAYPALwindowTimer);
                delete PAYPALwindowTimer;
                if ( typeof( PAYPALwindow_callback) == 'function') {
                    var parsedResult = false;
                    try {
                        parsedResult = JSON.parse( PAYPALwindow.document.body.dataset.result);
                    }
                    catch (err) {
                    }
                    PAYPALwindow_callback( parsedResult);
                    PAYPALwindow_callback = null;
                    delete PAYPALwindow_callback;
                }
                PAYPALwindow = null;
                delete PAYPALwindow;
            }
        }, 100);
    }
    return( PAYPALwindow);
}