function actu_next(event) {
	Event.stop(event);
	if(!moving && nav < 2) {
		document.getElementById("defilement"+(nav)).className = "point";
		document.getElementById("defilement"+(nav+1)).className = "pointS";
		new Effect.MoveBy('clip-actus', 0, -((nav+1) * 512) - document.getElementById("clip-actus").offsetLeft, { duration: 2.0, beforeStart: block, afterFinish: actu_next_end });
		new Effect.Opacity('clip-actus', { duration:0.5, from:1.0, to:0.5  });
		new Effect.Opacity('clip-actus', { duration:1, from:0.5, to:1.0, delay:1.5  });
	}
}
	
function actu_prev(event) {
	Event.stop(event);
	if(!moving && nav > 0) {
		document.getElementById("defilement"+(nav)).className = "point";
		document.getElementById("defilement"+(nav-1)).className = "pointS";
		new Effect.MoveBy('clip-actus', 0, -((nav-1) * 512) - document.getElementById("clip-actus").offsetLeft, { duration: 2.0, beforeStart: block, afterFinish: actu_prev_end });
		new Effect.Opacity('clip-actus', { duration:0.5, from:1.0, to:0.5  });
		new Effect.Opacity('clip-actus', { duration:1, from:0.5, to:1.0, delay:1.5  });
	}
}

function block() {
	moving = true;
}

function actu_next_end() {
	nav++;
	moving = false;
}

function actu_prev_end() {
	nav--;
	moving = false;
}

var nav = 0;
var moving = false;