function ventana (URL,w,h,s) {
  var height = h;
  var width = w;
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;
  if (window.screen) {
    var ah = screen.availHeight ;
    var aw = screen.availWidth ;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;
  }
  str += ",resizable=0,scrollbars="+s+",toolbar=0,status=0";
  open(URL,'Owasys',str);
}

function ventana2 (URL,w,h,s,t) {
  var height = h;
  var width = w;
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;
  if (window.screen) {
    var ah = screen.availHeight ;
    var aw = screen.availWidth ;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;
  }
  str += ",resizable=0,scrollbars="+s+",toolbar=0,status=0";
  winpop = window.open(URL,t,str);

    
 if (winpop != null)
        {
          if (winpop.opener == null)
          winpop.opener = self;
        }
    
   
}

function ventana3 (URL,w,h,s) {
  var height = h;
  var width = w;
  var str = "height=" + height + ",innerHeight=" + height;
  str += ",width=" + width + ",innerWidth=" + width;
  if (window.screen) {
    var ah = screen.availHeight ;
    var aw = screen.availWidth ;

    var xc = (aw - width) / 2;
    var yc = (ah - height) / 2;

    str += ",left=" + xc + ",screenX=" + xc;
    str += ",top=" + yc + ",screenY=" + yc;
  }
  str += ",resizable=0,scrollbars="+s+",toolbar=0,status=0";
  winpop = window.open(URL,'Owasys3',str);

    
 if (winpop != null)
        {
          if (winpop.opener == null)
          winpop.opener = self;
        }
    
   
}