function TamVentana() {   
  var Tamanyo = [0, 0];   
  if (typeof (window.innerWidth) != 'undefined')   
  {   
     Tamanyo = [window.innerWidth,window.innerHeight];   
  }   
  else   {   
 Tamanyo = [document.documentElement.clientWidth,document.documentElement.clientHeight];   
  }  
  return Tamanyo;   
}