function startUpload(){
      document.getElementById('f1_upload_process').style.visibility = 'visible';
      document.getElementById('f1_upload_form').style.visibility = 'hidden';
      return true;
}

function stopUpload(success){
      var result = '';
      if (success == 1){
         result = "<span class='msg'>L'arxiu s'ha enviat correctament!</span><br/><br/>";
      }
      else {
         result = "<span class='emsg'>S'ha produit un error en el process de enviament de l'arxiu!</span><br/><br/>";
      }
      document.getElementById('f1_upload_process').style.visibility = 'hidden';
      document.getElementById('f1_upload_form').innerHTML = result + '<label>Arxiu: <input name="myfile" type="file" size="15" /><\/label><label><input type="submit" name="submitBtn" class="sbtn" value="Enviar" /><\/label>';
      document.getElementById('f1_upload_form').style.visibility = 'visible';      
      return true;   
}