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 preload() {
	if (document.images) {

		tabs_01_over = newImage("images/tabs_01-over.jpg");
		tabs_02_over = newImage("images/tabs_02-over.jpg");
		tabs_03_over = newImage("images/tabs_03-over.jpg");
		tabs_04_over = newImage("images/tabs_04-over.jpg");

		preloadFlag = true;
	}
}