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) {
		menu1_time_over = newImage("images/menu1-time_over.gif");
		menu1_availability_over = newImage("images/menu1-availability_over.gif");
		menu1_quality_over = newImage("images/menu1-quality_over.gif");
		menu1_effectiveness_over = newImage("images/menu1-effectiveness_over.gif");
		menu1_simplicity_over = newImage("images/menu1-simplicity_over.gif");
		menu1_simplicity2_over = newImage("images/menu1-simplicity2_over.gif");
		simplicity_over = newImage("images/simplicity-over.gif");
		menu2_time_over = newImage("images/menu2-time_over.gif");
		menu2_availability_over = newImage("images/menu2-availability_over.gif");
		menu2_quality_over = newImage("images/menu2-quality_over.gif");
		menu2_effectiveness_over = newImage("images/menu2-effectiveness_over.gif");
		menu2_simplicity_over = newImage("images/menu2-simplicity_over.gif");
		menu2_simplicity2_over = newImage("images/menu2-simplicity2_over.gif");
		virtucallMenu_05_time_over = newImage("images/virtucallMenu_05-time_over.gif");
		virtucallMenu_05_availability_over = newImage("images/virtucallMenu_05-availabili.gif");
		virtucallMenu_05_quality_over = newImage("images/virtucallMenu_05-quality_ov.gif");
		virtucallMenu_05_effectiveness_over = newImage("images/virtucallMenu_05-effectiven.gif");
		virtucallMenu_05_simplicity_over = newImage("images/virtucallMenu_05-simplicity.gif");
		virtucallMenu_05_simplicity2_over = newImage("images/virtucallMenu_05-simplic-25.gif");
		effectiveness_over = newImage("images/effectiveness-over.gif");
		simplicity2_simplicity_over = newImage("images/simplicity2-simplicity_over.gif");
		quality_over = newImage("images/quality-over.gif");
		effectiveness2_effectiveness_over = newImage("images/effectiveness2-effectivenes.gif");
		menu3_availability_over = newImage("images/menu3-availability_over.gif");
		menu3_quality_over = newImage("images/menu3-quality_over.gif");
		menu3_effectiveness_over = newImage("images/menu3-effectiveness_over.gif");
		menu3_simplicity_over = newImage("images/menu3-simplicity_over.gif");
		menu3_simplicity2_over = newImage("images/menu3-simplicity2_over.gif");
		virtucallMenu_13_availability_over = newImage("images/virtucallMenu_13-availabili.gif");
		virtucallMenu_13_quality_over = newImage("images/virtucallMenu_13-quality_ov.gif");
		virtucallMenu_13_effectiveness_over = newImage("images/virtucallMenu_13-effectiven.gif");
		virtucallMenu_13_simplicity_over = newImage("images/virtucallMenu_13-simplicity.gif");
		virtucallMenu_13_simplicity2_over = newImage("images/virtucallMenu_13-simplic-47.gif");
		availability_over = newImage("images/availability-over.gif");
		time_over = newImage("images/time-over.gif");
		preloadFlag = true;
	}
}