function playAudio(audioUrl){
	location.href = 'audio/' + audioUrl;
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		AboutRobert_roll = newImage("images/button-About-rolled.jpg");
		StudioSpecs_roll = newImage("images/button-Studio-rolled.jpg");
		MyAlterEgo_roll = newImage("images/button-AlterEgo-rolled.jpg");
		Contact_roll = newImage("images/button-Contact-rolled.jpg");
		preloadFlag = true;
	}
}