var boutonArriere=$("#arriere");
	boutonArriere.click(deplacementArriere2);
	
	var boutonAvant=$("#avant");
	boutonAvant.click(deplacementAvant2);
function deplacementArriere2(){
	var div = $("#crea div:first-child");
	div.appendTo($("#crea"));
alert('arriere!');
	}