function addComments(id) {
  window.open("ajoutCommentaires.php?id="+id+"", "", 
		"width=350,height=450,location=no,status=no,toolbar=no,scrollbars=no,left=" + 
		((screen.width - 350)/2) + ",top=" + ((screen.height - 450)/2) ) 
}
function showComments(id) {
  window.open("montrerCommentaires.php?id="+id+"", "", 
		"width=350,height=450,location=no,status=no,toolbar=no,scrollbars=no,left=" + 
		((screen.width - 350)/2) + ",top=" + ((screen.height - 450)/2) ) 
}
function addBook() {
  window.open("ajoutLivre.php", "", 
		"width=350,height=450,location=no,status=no,toolbar=no,scrollbars=no,left=" + 
		((screen.width - 350)/2) + ",top=" + ((screen.height - 450)/2) ) 
}
function showPics(id) {
  window.open("montrerPhotos.php?id="+id+"", "", 
		"width=800,height=600,location=no,status=no,toolbar=no,scrollbars=yes,left=" + 
		((screen.width - 800)/2) + ",top=" + ((screen.height - 600)/2) ) 
}
function closeWindow() {
  opener.location.reload(); 
  self.close();
}