function preload()
{
	var image_1 = new Image();
	image_1.src = "images/logo-cheque-dejeuner.gif";
	var image_2 = new Image();
	image_2.src = "images/damier-01.gif";
	var image_3 = new Image();
	image_3.src = "images/damier-02.gif";
	var image_4 = new Image();
	image_4.src = "images/damier-03.gif";
	var image_5 = new Image();
	image_5.src = "images/fleche-01.gif";
	var image_6 = new Image();
	image_6.src = "images/bouton-blanc.jpg";
}

function tri()
{
	var choix = document.getElementById('choix');
	choix.value = 'tri';
}

function ajout()
{
	var choix = document.getElementById('choix');
	choix.value = 'ajout';
}