// Fonction de tremblement
function secouer(nb) {
	/*
	var sens = -1;
	var X = 0; 
	var Y = 0; 
	var dx; 
	var dy;
	for (no=nb;no>1;no=no-0.1) {
		dx=-X+sens*Math.round(no*Math.random());
		dy=-Y+sens*Math.round(no*Math.random());
		X=X+dx; Y=Y+dy;
		top.moveBy(dx,dy);
		sens=sens*(-1);
	}
	top.moveBy(-X,-Y);
	*/
}