function avis(pageContext) {
	var url_avis = "/app/textos_legals.jsp";
	if (pageContext) {
		url_avis=pageContext+url_avis;
	}
	openCentralPopup(520,450,url_avis);
	}

function openCentralPopup(w,h,url) {
		 var name="central_popup";
		 var t=(screen.height/2 - (h/2));
		 var l=(screen.width/2 - (w/2));
		
		 var wtmp=window.open(url,name,'top='+t+',left='+l+',width='+w+',height='+h+',status=no,scrollbars=no,toolbar=no,location=no,resizable=no');
		 if (wtmp) {		 wtmp.focus(); }
}