function validateAddPhotos(){
  var directory=$('directory').value;
  var folder=$('folder').value;
  var zip=$('zip').value;

  if(directory=="" || folder=="" || zip=="" ){
    alert("Il faut fournir au moins: le dossier cible et le fichier zip");
    return false;
  }
  else{
    return true;
  }
}

function selectFolder(id,dir){
  var popupPosition = {left: parseInt(window.screen.availWidth / 3), top: parseInt(window.screen.availHeight / 3)};
  window.open('openwysiwyg/addons/imagelibrary/insert_folder.php?input=' + id +'&hiddeninput='+ dir, 'popup', 'location=0,status=0,scrollbars=0,resizable=1,width=' + 320 + ',height=' + 250 + ',top=' + popupPosition.top + ',left=' + popupPosition.left).focus();
}