//preload background-a na subbutona:
	var hb_home = new Image();
	hb_home.src = 'http://spatia-tour.com/graphics/hb_home.png';
	var hb_eco = new Image();
	hb_eco.src = 'http://spatia-tour.com/graphics/hb_eco.png';
	var hb_contactUs = new Image();
	hb_contactUs.src = 'http://spatia-tour.com/graphics/hb_contactUs.png';
	var hb_busTour = new Image();
	hb_busTour.src = 'http://spatia-tour.com/graphics/hb_busTour.png';
	var hb_airTour = new Image();
	hb_airTour.src = 'http://spatia-tour.com/graphics/hb_airTour.png';
	var hb_aboutUs = new Image();
	hb_aboutUs.src = 'http://spatia-tour.com/graphics/hb_aboutUs.png';