// JavaScript Document
function ventana(url,w,h){
	pos_izq = (screen.width) ? (screen.width-w)/2 : 0;
	pos_arriba  = (screen.height) ? (screen.height-h)/3 : 0;

	configuracion = "height=" + h + ",width=" + w + ",top=" + pos_arriba + ",left=" + pos_izq + ",scrollbars=no,resizable=no";
	win = window.open(url,"movie",configuracion)
	win.focus();
}