function PopUpWindow(URL,Ancho,Alto,Scroll) {
	ventana = window.open(URL, "", 'top=100,left=100,width='+Ancho+',height='+Alto+',fullscreen=no,toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=1,scrolling='+Scroll+',scrollbars='+Scroll);
	ventana.moveTo ((screen.width-Ancho)/2,(screen.height-Alto)/2);
}