<script type="text/javascript">
function generer_password(champ_cible) {
var ok = 'azertyupqsdfghjkmwxcvbn23456789AZERTYUPQSDFGHJKMWXCVBN';
var pass = '';
longueur = 5;
for(i=0;i<longueur;i++){
var wpos = Math.round(Math.random()*ok.length);
pass+=ok.substring(wpos,wpos+1);
}
document.getElementById(champ_cible).value = pass;
}
/*
<input name="password" id="password" type="text" />
<input type="button" name="generer" value="Générer" onclick="javascript:generer_password('password');" />
*/
</script>