Comment compter nombre de clics sur un lien ?

<script type="text/javascript"> 
	function refresh(id)
	{
		document.location.href="home.php?c=6&i="+id ; 
	}
</script>

<a target="_blank" onclick="refresh(id_lien);" href="url" title=""> Lien à cliquer</a>

<?php
	if(isset($_GET['i']) && $_SESSION['incremente'] != $_GET['i']) {
		
	mysql_connect("mysql3-3.perso", "user", "mdp"); 
	mysql_select_db("bdd"); 
		
	$id = $_GET['i'];
	$query = mysql_query("SELECT * FROM films WHERE id='".$id."'");
		
	$donnees = mysql_fetch_array($query);
	$donnees['nb_telechargement']++;
	mysql_query("UPDATE films SET nb_telechargement='" . $donnees['nb_telechargement'] . "' WHERE id='".$id."'");
	
?>