// JavaScript

function Nueva_Ventana (URL,nombre,x,y,scrolleable){ 
   var topy=(screen.height/2)-(y/2);
   var leftx=(screen.width/2)-(x/2);
   window.open(URL,nombre,"width="+x+",height="+y+", location=no, directories=no, scrollbars="+scrolleable+", menubar=no, status=no, toolbar=no, resizable=no, top="+topy+",left="+leftx);
} 

function Cerrar_Ventana () {
	window.opener = top ;
	window.close();
}