var myimages = new Array();

function preLoadImages(){
	for (x=0; x<preLoadImages.arguments.length; x++){
		myimages[x] = new Image();
		myimages[x].src = preLoadImages.arguments[x];
	}
}

preLoadImages("images/home.jpg","images/contact.jpg","images/editorial.jpg","images/subscription.jpg","images/events.jpg","images/career.jpg",
			"images/homeo.jpg","images/contacto.jpg","images/editorialo.jpg","images/subscriptiono.jpg","images/eventso.jpg","images/careero.jpg",
			"images/homes.jpg","images/contacts.jpg","images/editorials.jpg","images/subscriptions.jpg","images/eventss.jpg","images/careers.jpg");

function lightup(imgName){
	document[imgName].src= "images/" + imgName + "o.jpg";	
}

function turnoff(imgName){
   document[imgName].src= "images/" + imgName + ".jpg";
}