function help(pagina){			
	var inchisa = (typeof(w) == "undefined");
	if (!inchisa){
		inchisa = w.closed;
	}
	if (inchisa){
		w = window.open("../help/" + pagina, "_blank", "top=250,left=250,height=300,width=500,menubar=no,resizable=yes,scrollbars=yes,status=no,toolbar=no");
	}
	else{
		w.focus();
	}
}