ciao, ho popolato la mia pagina con php da un DB. il risultato e' praticamente uguale a quello discusso nel thread.
solo che non funziona e non riesco capire dove sbaglio. aiuto..
vi posto il codice:

<script type="text/javascript">
var dati = new Objetc() 
dati["2010-06-26"] = [ {value:"0", text:"08:00:00"} ];
dati["2010-06-27"] = [ {value:"1", text:"08:20:00"}, {value:"2", text:"08:00:00"} ];
dati["2010-06-28"] = [ {value:"3", text:"08:20:00"} ];
dati["2010-08-28"] = [ {value:"4", text:"21:20:00"} ];

function setSlot(chooser) {
    var newElem;
    var where = (navigator.appName == "Microsoft Internet Explorer") ? -1 :    null; 
    var slotChooser = chooser.form.elements["slot"];
    while (slotChooser.options.length) {
        slotChooser.remove(0);
    }
    var choice = chooser.options[chooser.selectedIndex].value;
    var db = dati[choice];
    newElem = document.createElement("option");
    newElem.text = "seleziona uno slot:";
    newElem.value = "";
    slotChooser.add(newElem, where);
    if (choice != "") {
        for (var i = 0; i < db.length; i++) {
            newElem = document.createElement("option");
            newElem.text = db*.text;
            newElem.value = db*.value;
            slotChooser.add(newElem, where);
        }
    }
}
  

</script>
<table>
 <form action="" method="post" name="frmCart" id="frmCart">
Data:
<select name="data" onchange="setSlot(this)">
<option value="" selected="selected">data</option>
<option value="2010-06-26">2010-06-26</option>
<option value="2010-06-27">2010-06-27</option>
<option value="2010-06-27">2010-06-27</option>
<option value="2010-06-28">2010-06-28</option>
<option value="2010-08-28">2010-08-28</option>

</select>
</td></tr>
<tr><td colspan="8">
Slot:
<select name="slot" onchange="this.form.submit();">
<option value="" selected="selected">Seleziona uno slot</option>
</select>
</form>
</table>