function nwindow(mypage,myname,w,h,scroll,pos)
{
  if (pos=="random")
  {
    LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;
    TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;
  }
  else if (pos=="center")
  {
    LeftPosition=(screen.width)?(screen.width-w)/2:100;
    TopPosition=(screen.height)?(screen.height-h)/2:100;
  }
  else
  {
    LeftPosition=0;
    TopPosition=20;
  }

  settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
  win=window.open(mypage,myname,settings);

  if(win.focus)
  {
    win.focus();
  }
}
function redimensionar (ancho, alto)
{
  LeftPosition=(screen.width)?(screen.width-ancho)/2:100;
  TopPosition=(screen.height)?(screen.height-alto)/2:100;

  window.moveTo(LeftPosition,TopPosition);
  window.resizeTo(ancho,alto);
  window.focus();
}