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) {
		index_06_over = newImage("images/index_06-over.gif");
		index_21_over = newImage("images/index_21-over.gif");
		index_22_over = newImage("images/index_22-over.gif");
		index_81_over = newImage("images/index_81-over.gif");
		index_83_over = newImage("images/index_83-over.gif");
		index_85_over = newImage("images/index_85-over.gif");
		preloadFlag = true;
	}
}