La liste deroulante en php

<script language="javascript">
function testage()
{
var i;
var tab;
var nbopt = document.getElementById('pouet').options.length;

for (i = 0; i < nbopt; i++)
	{
	tab = document.getElementById('pouet').options[i].id.split(';');
	if (document.getElementById('pouet').options[i].selected)
		document.getElementById('pouet').options[i].text = tab[0];
	else
		document.getElementById('pouet').options[i].text = tab[0]+' '+tab[1];
	}
}

</script><br /><br />
<br />
LISTE :<select id="pouet" name="pouet" Onchange="javascript: testage();">
<option id="Pwet;coucou">Pwet coucou</option>
<option id="Truc;coucou">Truc coucou</option>
<option id="Test;coucou">Test coucou</option>
</select>

<script language="javascript">
function text_modif()
{
var i;
var tab;
var nbopt = document.getElementById('famille').options.length;

for (i = 1; i < nbopt; i++)
	{
	tab = document.getElementById('famille').options[i].id.split(';');
	if (document.getElementById('famille').options[i].selected)
		document.getElementById('famille').options[i].text = tab[0];
	else
		document.getElementById('famille').options[i].text = tab[0]+' - '+tab[1];
	}
}
</script>



<select name='famille' id='famille' style='width:200px' onchange='f_famille_designation();f_sous_famille_code();text_modif();'>

<?php
$res=mysql_query("select * from famille order by code_famille") or die ("Requête non executée.");

echo"<option value='-1'>Choisir une famille</option>";
while($row = mysql_fetch_array($res)){
$Codefamille = $row['code_famille'];
$Designation = $row['designation'];
echo '<option id="'.$Codefamille.";".$Designation.'" value="'.$row['famille_id'].'">'.($Codefamille."-".$Designation) .'</option>';
}
?>
</select>