// Gestion du roll-over
	function imgSwap(pic1,pic2)
	{
		if (document.images) 
		{
			document.images[pic1].src = eval(pic2 + ".src");
		}
	}
	// si le navigateur supporte le swap d'image
	if (document.images)
	{
		// Navigation de gauche
		navg_credit_1 = new Image(156, 43);
		navg_credit_1.src = "img/navg_credit_off.gif";
		navg_credit_2 = new Image(156, 43);
		navg_credit_2.src = "img/navg_credit_on.gif";

		navg_lexique_1 = new Image(156, 29);
		navg_lexique_1.src = "img/navg_lexique_off.gif";
		navg_lexique_2 = new Image(156, 29);
		navg_lexique_2.src = "img/navg_lexique_on.gif";
		
		navg_calcul_1 = new Image(156, 43);
		navg_calcul_1.src = "img/navg_calcul_off.gif";
		navg_calcul_2 = new Image(156, 43);
		navg_calcul_2.src = "img/navg_calcul_on.gif";

		navg_qui_1 = new Image(156, 29);
		navg_qui_1.src = "img/navg_qui_off.gif";
		navg_qui_2 = new Image(156, 29);
		navg_qui_2.src = "img/navg_qui_on.gif";
	}