$addHandler = function(element, eventName, handler) {
    if(element == window && eventName =="scroll") {
        handler = function(){return false};    
    }
    Sys.UI.DomEvent.addHandler(element, eventName, handler)
}
$removeHandler = function(element, eventName, handler) {
    if(element == window && eventName =="scroll") {
        return;
    }
    Sys.UI.DomEvent.removeHandler(element, eventName, handler);
}