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) {
		menu_03_over = newImage("images/menu_03-over.jpg");
		menu_05_over = newImage("images/menu_05-over.jpg");
		menu_06_over = newImage("images/menu_06-over.jpg");
		menu_07_over = newImage("images/menu_07-over.jpg");
		preloadFlag = true;
	}
}

var pole = ['menu1','menu2','menu3'];
var timeid = ['','',''];

function odkryj(a) {
document.getElementById(pole[arguments[0]]).style.visibility='visible';
}

function skryj(a,b) {
if (arguments[1]==0) timeid[arguments[0]]=setTimeout('skryj('+arguments[0]+',1)',1000);
else document.getElementById(pole[arguments[0]]).style.visibility='hidden';
}

function zrus_cas(a) {
clearTimeout(timeid[arguments[0]]);
}