var timeOn = null;
var preloadFlag = false;

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) {
		nav_home_over = newImage("images/nav_home-over.jpg");
		nav_ruby_over = newImage("images/nav_ruby-over.jpg");
		nav_thework_over = newImage("images/nav_thework-over.jpg");
		nav_books_over = newImage("images/nav_books-over.jpg");
		nav_media_over = newImage("images/nav_media-over.jpg");
		nav_bookings_over = newImage("images/nav_bookings-over.jpg");
		nav_contact_over = newImage("images/nav_contact-over.jpg");
		nav_sitemap_over = newImage("images/nav_sitemap-over.jpg");

        HTMLmenu1_1_over = newImage("images/submenus/roller_work_main-over.jpg");
        HTMLmenu1_2_over = newImage("images/submenus/roller_work_personal-over.jpg");
        HTMLmenu1_3_over = newImage("images/submenus/roller_corporate-over.jpg");

		preloadFlag = true;
	}
}

function preloadImages() {
    if (document.images) {
        preloadFlag = true;
    }
}

var currentDisplayed = "";

function hideMenu() {
    if (document.getElementById(currentDisplayed)) {
        disItem =  document.getElementById(currentDisplayed);
        disItem.style.display = 'none';
    }
}

function showMenu(targ) {
    disItem =  document.getElementById(targ);
    disItem.style.display = 'block';

    currentDisplayed = targ;
}

function menuOn() {
    clearTimeout(timeOn);
}

function menuOff() {
    timeOn = setTimeout("hideMenu()", 200);
}