function popup(url, width, height, scrollbars) {
	if(scrollbars == undefined || scrollbars == "" || scrollbars == null) {
		var scrollbars = "no";
	}
	if(height == undefined || height == "" || height == null) {
		var height = 50;
		var top = 180;
	} else {
		var top = ((screen.height - height) / 2) - 5;
	}
	var left = (screen.width - width) / 2;
	this.popupOpen = window.open(url,'popup','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+scrollbars+',resizable=no,width='+width+',height='+height+',top='+top+',left='+left+'');
}

function popupBientotDispo() {
	popup('bientot_disponible.html',250,480);
}