var numOfMainMenuItems = 4;
var numOfSubMenuItems = 4;
var timerID = null;
var pageActive = false;

PreloadNavImages();

function closeAll() {
	var i=1;
	for (i=1; i<=numOfMainMenuItems; i++) {
		document.getElementById('dropmenu' + i).style.display = 'none';
		document.getElementById('navbar-button-' + i).src = '/images/navbar-button-' + i + '.gif';
	}
}

function openClose(menuItem) {
	var menuNum = menuItem.split("-");
	closeAll();
	clearTimeout(timerID);
	if (menuNum[2]==1 || menuNum[2]==3)
		{
			document.getElementById('dropmenu' + menuNum[2]).style.display = 'block';
		}
	document.getElementById('navbar-button-' + menuNum[2]).src = '/images/navbar-button-' + menuNum[2] + '-on.gif';
}

function closeAllMenus() {
	timerID = setTimeout('closeAll()',300);
}

function KeepMenuOpen() {
	clearTimeout(timerID);
}

function PreloadNavImages() {
	image1 = new Image();
	image1.src = "/images/navbar-button-1-on.gif";
	image2 = new Image();
	image2.src = "/images/navbar-button-2-on.gif";
	image3 = new Image();
	image3.src = "/images/navbar-button-3-on.gif";
	image4 = new Image();
	image4.src = "/images/navbar-button-4-on.gif";
}