function showEngine(t) {
	$("#engine_"+t).fadeIn(2500);
	$("#words_"+t).fadeIn(2500);
}

function hideEngine(t) {
	$("#engine_"+t).fadeOut(2500);
	$("#words_"+t).fadeOut(2500);
}

function switchEngine(force) {
	nextenginecurrent = enginecurrent+1;
	if(nextenginecurrent > 6) {
		nextenginecurrent = 1;
		if (!force) {
			return;
		}
	}
	if(nextenginecurrent == 2) {
		if (!force) {
			return;
		}
	}
	hideEngine(enginecurrent);
	showEngine(nextenginecurrent);
	enginecurrent = nextenginecurrent;
}

$(document).ready(function() {
	enginetimer = setInterval("switchEngine(false)", 5000);
});

$("#engine img").click(function () {
	clearInterval(enginetimer);
	switchEngine(true);
	enginetimer = setInterval("switchEngine(false)", 5000);
});