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) {
		l1_over = newImage("./img/4-2-na.gif");
		l2_over = newImage("./img/4-3-to.gif");
		l3_over = newImage("./img/4-4-us.gif");
		l4_over = newImage("./img/4-5-ko.gif");
		l5_over = newImage("./img/4-6-vk.gif");
		preloadFlag = true;}}