function verification()
{
  ok = true;
   
  if (document.getElementById('nom').value =='')
  {
    document.getElementById('nom').style.border = '1px solid red';
    ok = false;
  }
  else
    document.getElementById('nom').style.border = 'none';  
   
  if (document.getElementById('email').value == '')
  {
    document.getElementById('email').style.border = '1px solid red';
    ok = false;
  }
  else
    document.getElementById('email').style.border = 'none';
   
  if (document.getElementById('msg').value == '')
  {
    document.getElementById('msg').style.border = '1px solid red';
    ok = false;
  }
  else
    document.getElementById('msg').style.border = 'none';     
   
  if (ok)
    document.forms['form'].submit();  	
  else
    alert('Veuillez compléter les champs entourés de rouge.');
}