function ShowWaitingScreen()
{
    var ok = true;

    if(self.Page_ClientValidate)
        ok = Page_ClientValidate();

    if(ok)
    {
        var div1 = document.getElementById("WaitingScreenWrapper");   
        var div2 = document.getElementById("WaitingScreen");   
        if(div1) div1.style.visibility = "visible";
        if(div2) div2.style.visibility = "visible";
    }
}

function ShowWaitingScreenWhenConfirm(question)
{
    if(confirm(question))
    {
        ShowWaitingScreen();
        return true;
    }
    else
        return false;
}