function switch_nav_pv(i) {
	var el = document.getElementById(i);
	var el1 = document.getElementById(i + '_1');

	if ((el.style.backgroundImage == '') || (el.style.backgroundImage == "url(images/premiere-visite/nav-premiere-visite-off.gif)")
							|| (el.style.backgroundImage == "url(images/premiere-visite/nav-premiere-visite-off2.gif)")) {
		el.style.backgroundImage = "url(images/premiere-visite/nav-premiere-visite-on.gif)";
		el1.style.color = "#ffffff";	
	}
	else {
		if (i = 'nav_pv_1') {
			el.style.backgroundImage = "url(images/premiere-visite/nav-premiere-visite-off2.gif)";
		}
		else {
			el.style.backgroundImage = "url(images/premiere-visite/nav-premiere-visite-off.gif)";
		}
		el1.style.color = "#bd5e77";
	}
}