var idx = 0;
function swap_image() {	
	var src = 0;
	var alt = 1;
	var dat = [
		['images/equipment/komori.jpg', ' Komori System 38S'],
		['images/equipment/mbo.jpg', '36-inch MBO Perfection'],	
		['images/equipment/bravoplus.jpg', 'Muller-Martini Bravo Plus'],
		['images/equipment/akiyama.jpg', 'Akiyama 6-Color with Inline Aqueous']						
	];
	idx = (idx == (dat.length - 1)) ? 0 : idx + 1;	
	var img = dat[idx];	
	$('equipment_main').src = img[src];
	$('equipment_main').alt = img[alt];
}
window.setInterval(swap_image, 4000);