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) {
		homeBut_over = newImage("images/homeBut_over.gif");
		identitiesBut_over = newImage("images/identitiesBut_over.gif");
		postersBut_over = newImage("images/postersBut_over.gif");
		exhibitsBut_over = newImage("images/exhibitsBut_over.gif");
		donorBut_over = newImage("images/donorBut_over.gif");
		printBut_over = newImage("images/printBut_over.gif");
		packagingBut_over = newImage("images/packagingBut_over.gif");
		publicationsBut_over = newImage("images/publicationsBut_over.gif");
		studioBut_over = newImage("images/studioBut_over.gif");
		contactBut_over = newImage("images/contactBut_over.gif");
		preloadFlag = true;
	}
}