var preloadFlag = false;  

function preloadImages() {
	if (document.images) {
		img1 = newImage("images/map_blue_ardmore.jpg");
		img2 = newImage("images/map_blue_calera.jpg");
		img3 = newImage("images/map_blue_davis.jpg");
		img4 = newImage("images/map_blue_durant.jpg");
		img5 = newImage("images/map_blue_kingston.jpg");
		img6 = newImage("images/map_blue_lone.jpg");
		img7 = newImage("images/map_blue_purcell.jpg");
		img8 = newImage("images/map_blue_sulphur.jpg");
		img9 = newImage("images/map_blue_madill.jpg");
		img10 = newImage("images/map_blue_thackerville.jpg");
		img11 = newImage("images/map_blue_mead.jpg");
		img12 = newImage("images/map_blue_pauls_valley.jpg");
		img13 = newImage("images/map_blue_eufaula.jpg");
		img14 = newImage("images/map_blue_atoka.jpg");
		img15 = newImage("images/map_blue_wynnewood.jpg");
		img16 = newImage("images/map_blue_mcalester.jpg");
		preloadFlag = true;
	}
} 

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

function show (id_obj) {
 	if (id_obj != null) {
		obj = document.getElementById(id_obj);
		obj.style.display = 'block';
	}
	return true;
}

function hide (id_obj) {
 	if (id_obj != null) {
		obj = document.getElementById(id_obj);
		obj.style.display = 'none';
	}  		
	return true;
}