function newImage(arg) {
	if (document.images) {
		var 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;

var imgBackground = newImage("images/content-background.jpg");

function preloadImages()
{
	if (document.images)
	{
		var aButton = new Array();
		var aButtonOver = new Array();

		aButton[aButton.length] = newImage("images/menu-home.gif");
		aButton[aButton.length] = newImage("images/menu-about.gif");
		aButton[aButton.length] = newImage("images/menu-software.gif");
		aButton[aButton.length] = newImage("images/menu-service-support.gif");
		aButton[aButton.length] = newImage("images/menu-contact.gif");

		aButtonOver[aButton.length] = newImage("images/menu-home-over.gif");
		aButtonOver[aButton.length] = newImage("images/menu-about-over.gif");
		aButtonOver[aButton.length] = newImage("images/menu-software-over.gif");
		aButtonOver[aButton.length] = newImage("images/menu-service-support-over.gif");
		aButtonOver[aButton.length] = newImage("images/menu-contact-over.gif");

		preloadFlag = true;
	}
}