function affichePlan(noplan, opt) {
	var obj_plan=document.getElementById("plan"+noplan);
	if (opt==1) {
		obj_plan.open;
		obj_plan.innerHTML="<span class='wait'>chargement en cours...</span>";
		obj_plan.close;
		//
		var xhr_object=null;
		if(window.XMLHttpRequest) {
			xhr_object=new XMLHttpRequest();
		} else {
			if(window.ActiveXObject) {
				xhr_object=new ActiveXObject("Microsoft.XMLHTTP");
			} else {
				alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
				return;
			}
		}
		xhr_object.open("POST", "plan_agence.php", true);
		xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		xhr_object.send("noplan="+noplan);
		xhr_object.onreadystatechange = function() {
			if(xhr_object.readyState == 4) {
				obj_plan.open;
				obj_plan.innerHTML=xhr_object.responseText;
				obj_plan.close;
			}		
		}
	} else {
		obj_plan.open;
		obj_plan.innerHTML="<a href='javascript:affichePlan("+noplan+",1);'>Afficher le plan d'accès</a>";
		obj_plan.close;
	}
}