function reposicio() {
      var browser=navigator.appName
      if (browser.indexOf("Explorer") >  -1) { altura = document.documentElement.clientHeight; }
      if (browser.indexOf("Explorer") == -1) { altura = window.innerHeight; }
      Total = (altura - 155);
      if (altura >= 829) { Total = "612" ; }
      document.getElementById('FranjaInferior').style.top    = Total + "px";
      document.getElementById('FranjaSuperior').style.height = (Total - 15) + "px"; 
    }
    reposicio();