//<![CDATA[
  function check_page() {
    var start = document.cookie.indexOf("pagina=" );
    var len = start + 'pagina'.length + 1;
   
    if(!start && 'pagina' != document.cookie.substring(0, name.length)) {
      return null;
    }
   
    if(start == -1) return null;
    var end = document.cookie.indexOf(";", len);
    if(end == -1) end = document.cookie.length;
    var pagina = unescape(document.cookie.substring(len, end));
   
    if(pagina) {
      document.getElementById('ifra').src = pagina;
     
      var today = new Date();
      today.setTime(today.getTime());
      var expires_date = new Date(today.getTime() + (-1 * 1000 * 60 * 60 * 24));
 
      document.cookie = "pagina=" + ";expires=" + expires_date.toGMTString() + ";path=/";
    }
  }
//]]>