function clearUsername()
 {
  var username = document.form.username.value ;
  if (username == 'Pseudo ou email')
  {
  	document.form.username.value ="";
  }
  
 }
 
  function clearPassword()
 {
  var password = document.form.password.value ;
  if (password == '1234')
  {
  	document.form.password.value ="";
  }
  
 }