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) {
		index06_over = newImage("img/index06-over.gif");
		index07_over = newImage("img/index07-over.gif");
		index08_over = newImage("img/index08-over.gif");
		index09_over = newImage("img/index09-over.gif");
		index10_over = newImage("img/index10-over.gif");
		index11_over = newImage("img/index11-over.gif");
		index12_over = newImage("img/index12-over.gif");
		index13_over = newImage("img/index13-over.gif");
		preloadFlag = true;
	}
}