var waitDialogShown = false;
var useTimerBeforeShowWaitDialog = true;
var waitDialogTimeout = 50;
var waitDialogTimer;
var wait_dlg = 'wait-dialog';

function showWaitDialog() {
    if (!waitDialogShown) {
        Richfaces.showModalPanel(wait_dlg);
        waitDialogShown = true;
    }
}
function onRequestStart() {
    if (useTimerBeforeShowWaitDialog) {
        waitDialogTimer = setTimeout("showWaitDialog();", waitDialogTimeout);
    } else {
        showWaitDialog();
    }
}
function onRequestEnd() {
    if (waitDialogShown) {
        Richfaces.hideModalPanel(wait_dlg);
        waitDialogShown = false;
    } else if (useTimerBeforeShowWaitDialog && waitDialogTimer) {
        clearTimeout(waitDialogTimer);
    }
}