var HOME = 0;
var OUR_MISSION = 1;
var WORK_HISTORY = 2;
var EQUIPMENT = 3;
var CONTACT_US = 4;

function isIE() {
	return (navigator.appName.indexOf("Microsoft") != -1);
}

function gotoPage(arg) {
	if (arg == HOME) { location.href = "index.html"; }
	if (arg == OUR_MISSION) { location.href = "ourmission.html"; }
	if (arg == WORK_HISTORY) { location.href = "workhistory.html"; }
	if (arg == EQUIPMENT) { location.href = "equipment.html"; }
	if (arg == CONTACT_US) { location.href = "contactus.html"; }
	return true;
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	//alert(preloadFlag);
	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) {
		Home_over = newImage("images/Home-over.jpg");
		Our_Mission_over = newImage("images/Our-Mission-over.jpg");
		Work_History_over = newImage("images/Work-History-over.jpg");
		Equipment_over = newImage("images/Equipment-over.jpg");
		Contact_Us_over = newImage("images/Contact-Us-over.jpg");
		preloadFlag = true;
	}
}