// abort function for ajax requests
Ajax.Request.prototype.abort = function() {
    // prevent and state change callbacks from being issued
    this.transport.onreadystatechange = Prototype.emptyFunction;
                
    // abort the XHR
    this.transport.abort();
                        
    // update the request counter
    Ajax.activeRequestCount--;
};

// adding onload events
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}