var frmrewardsSubmit = true; // variable pour empecher les clicks abusifs sous IE

function valFrmrewards(f) {
  var frmrewards_fn = f.name;
  var frmrewards_ofn = document.forms[frmrewards_fn];
  var frmrewards_erreur = false;
  var frmrewards_nb_err = 0;
  
  if(!frmrewardsSubmit) return false;
  frmrewardsSubmit = false;
  
  var frmrewardsMsgerreur = "<ul>";
  
  if(document.getElementById('frmrewardsUsername').value == "") {
    frmrewards_erreur = true;
    frmrewards_nb_err++;
    frmrewardsMsgerreur += "<li>'Username' : Please write your username</li>";
  }
  
  if(document.getElementById('frmrewardsPassword').value == "") {
    frmrewards_erreur = true;
    frmrewards_nb_err++;
    frmrewardsMsgerreur += "<li>'Password' : Please write your password</li>";
  }

  frmrewardsMsgerreur += "</ul>";
      
  if (frmrewards_nb_err++ > 1)
    frmrewards_title_err = "The following fields require your attention:";
  else
    frmrewards_title_err = "The following field requires your attention:";
  
  if(frmrewards_erreur == true) {
    document.getElementById('frmrewardsError2').innerHTML = frmrewards_title_err + frmrewardsMsgerreur;
    document.getElementById('frmrewardsError').style.display = 'block';
    frmrewardsSubmit = true;
    return false;
  }
  else
    frmrewards_ofn.submit();
}