function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function changeImages() {
	if (document.images) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		bt_infos_over = newImage("img/nav/bt_infos-over.gif");
		barre1_bt_infos_over = newImage("img/nav/barre1-bt_infos_over.gif");
		barre1_bt_billet_over = newImage("img/nav/barre1-bt_billet_over.gif");
		bt_billet_over = newImage("img/nav/bt_billet-over.gif");
		barre2_bt_billet_over = newImage("img/nav/barre2-bt_billet_over.gif");
		barre2_bt_autour_de_lexpo_over = newImage("img/nav/barre2-bt_autour-de-lexpo_o.gif");
		bt_autour_de_lexpo_over = newImage("img/nav/bt_autour-de-lexpo-over.gif");
		barre3_bt_autour_de_lexpo_over = newImage("img/nav/barre3-bt_autour-de-lexpo_o.gif");
		barre3_bt_actu_over = newImage("img/nav/barre3-bt_actu_over.gif");
		bt_actu_over = newImage("img/nav/bt_actu-over.gif");
		barre4_bt_actu_over = newImage("img/nav/barre4-bt_actu_over.gif");
		barre4_bt_point_doc_over = newImage("img/nav/barre4-bt_point-doc_over.gif");
		bt_point_doc_over = newImage("img/nav/bt_point-doc-over.gif");
		barre5_bt_point_doc_over = newImage("img/nav/barre5-bt_point-doc_over.gif");
		barre5_bt_lexique_over = newImage("img/nav/barre5-bt_lexique_over.gif");
		bt_lexique_over = newImage("img/nav/bt_lexique-over.gif");
		barre6_bt_lexique_over = newImage("img/nav/barre6-bt_lexique_over.gif");
		barre6_bt_non_voyants_over = newImage("img/nav/barre6-bt_non-voyants_over.gif");
		bt_non_voyants_over = newImage("img/nav/bt_non-voyants-over.gif");
		animations_over = newImage("img/nav/bt_animations.gif");
		cinemas_over = newImage("img/nav/bt_cinemas.gif");
		conferences_over = newImage("img/nav/bt_conferences.gif");
		handicapes_over = newImage("img/nav/bt_handicapes.gif");
		education_over = newImage("img/nav/bt_education.gif");
		preloadFlag = true;
	}
}
function ouvrir(page){ 
window.open(page,'Lien','width=750,height=550,scrollbars=1,menubar=1,resizable=1,toolbar=1,status=1,location=1');
} 

function affAutour() {
 if (document.layers) { 
    // Navigateur Netscape 4.X
	if (document.layers["autour"].visibility=="hide")
	{
		document.layers["autour"].visibility="show";
		changeImages('barre2', 'img/nav/barre2-bt_autour-de-lexpo_o.gif', 'bt_autour_de_lexpo', 'img/nav/bt_autour-de-lexpo-over.gif', 'barre3', 'img/nav/barre3-bt_autour-de-lexpo_o.gif'); return true;
	}
  }
else
{
	if (document.getElementById('autour').style.visibility=='hidden')
	{
		document.getElementById('autour').style.visibility='visible';
		document.getElementById('ssMenuB').style.marginTop = -15;
		changeImages('barre2', 'img/nav/barre2-bt_autour-de-lexpo_o.gif', 'bt_autour_de_lexpo', 'img/nav/bt_autour-de-lexpo-over.gif', 'barre3', 'img/nav/barre3-bt_autour-de-lexpo_o.gif'); return true;
	}
 }
}
function cacheAutour() 
{
 	if (document.layers) 
 	{ 
    	// Navigateur Netscape 4.X
		if (document.layers["autour"].visibility=="show")
		{
			document.layers["autour"].visibility="hide";
			changeImages('barre2', 'img/nav/barre2.gif', 'bt_autour_de_lexpo', 'img/nav/bt_autour-de-lexpo.gif', 'barre3', 'img/nav/barre3.gif'); return true;
		}
  	}
	else
	{
		if (document.getElementById('autour').style.visibility=='visible')
		{
			document.getElementById('autour').style.visibility='hidden';
			document.getElementById('ssMenuB').style.marginTop = -30;
			changeImages('barre2', 'img/nav/barre2.gif', 'bt_autour_de_lexpo', 'img/nav/bt_autour-de-lexpo.gif', 'barre3', 'img/nav/barre3.gif'); return true;
		}
	
	}
}