function checkNavigation() {
	var x = readCookie('menu');
	if (x != null) {
		showHideNav(x);
	}
}

function showHideNav(id) {
	
	eraseCookie('menu');
	
	changeNav(id,0);
		
	createCookie('menu',id,1);
	
	//wait = 300; // set the time to wait for menu to be shown
	//timer = window.setTimeout("changeNav('" + id + "')", wait);
}

function clearTimer() {
	if (timer != null) { 
		window.clearTimeout(timer);
	}
}

function changeNav(id, wait) {
	
	hideNav('navHealthcare');
	hideNav('navIndustrial');
	hideNav('navEducation');
	hideNav('navLocalGovernment');
	hideNav('navCommercial');
	hideNav('navDefence');
	hideNav('navDataCentre');
	hideNav('navCustodial');
	hideNav('navResidential');
	
	showNav(id);

}

function showNav(id){ 
	if (document.getElementById){ 
		obj = document.getElementById(id); 
		obj.style.display = ""; 
	} 
} 

function hideNav(id){ 
	if (document.getElementById){ 
		obj = document.getElementById(id); 
		obj.style.display = "none"; 
	} 
} 

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}