// Función que abre una ventana en modo pop-up
function NewWindow(myurl,myname, w, h, scroll) {
	var winl = (screen.width)  ? (screen.width - w) / 2 : 0;
  	var wint = (screen.height) ? (screen.height - h) / 2 :0 ;
  	winprops='height='+h+',width='+w+',top='+wint+',left='+winl+', scrollbars='+scroll+',resizable';
  	win =window.open(myurl,myname,winprops);
  	if (parseInt(navigator.appVersion) >= 4) {
		win.window.focus();
  	}
}