function oimg(im) {
  var ancho=620; var alto=430;
  var posX= (screen.width-ancho)/2;
  var posY= (screen.height-(alto+70))/2;
  props= "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,resizable=0,copyhistory=0,width="+ancho+",height="+alto+",left=" +posX+ ",top=" +posY;
  nuevaventana = window.open(im,'Ventana1',props);
}
function oen(url) {
  var ancho=569; var alto=475;
  var posX= (screen.width-ancho)/2;
  var posY= (screen.height-(alto+70))/2;
  props= "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,resizable=0,copyhistory=0,width="+ancho+",height="+alto+",left=" +posX+ ",top=" +posY;
  nuevaventana = window.open(url,'Ventana2',props);
}
function nw(w) {
  var ancho=800; var alto=600;
  var posX= (screen.width-ancho)/2;
  var posY= (screen.height-(alto+70))/2;
  props= "toolbar=1,location=1,directories=1,status=1,menubar=1,scrollbars=yes,resizable=1,copyhistory=0,width="+ancho+",height="+alto+",left=" +posX+ ",top=" +posY;
  nuevaventana = window.open(w,'Ventana3',props);
}