function PreLoader(){     
    var imgs = [];      
    this.append = function(url1){
        imgs[imgs.length] = new Image (65, 62);
        imgs[imgs.length - 1].src = url1;
    }
}
    
var preLoader = new PreLoader();

function checkKeycode(e, k) {
	var keycode;
	if(window.event) keycode = window.event.keyCode; else if(e) keycode = e.which; else keycode = event.charCode;
	if(keycode == k) return true; else return false;
}

function popupHelp(address) {
	var w = window.open(address, 'MyVocal User\'s Guide', 'menubar=0,status=0,toolbar=0,width=360,height=640');
	w.moveTo(800, 0);
}