codice:
<script type="text/javascript">
var autistadb = new Object()
autistadb["14"] = [{value:"2", text:"Fiat 500 - BB 111 BB"},
{value:"1", text:"Fiat Punto - AA 000 AA"},
{value:"4", text:"Panda - AV123GR"}];
autistadb["8"] = [{value:"4", text:"Panda - AV123GR"},
{value:"2", text:"Fiat 500 - BB 111 BB"},
{value:"1", text:"Fiat Punto - AA 000 AA"}];
autistadb["10"] = [];
autistadb["9"] = [];
autistadb["16"] = [{value:"4", text:"Panda - AV123GR"}];

function setAut(chooser) {
    var newElem;
    var where = (navigator.appName == "Microsoft Internet Explorer") ? -1 : null;
    var autChooser = chooser.form.elements["Auto"];
    while (autChooser.options.length) {
        autChooser.remove(0);
    }
    var choice = chooser.options[chooser.selectedIndex].value;
    var db = autistadb[choice];
    newElem = document.createElement("option");
    newElem.text = "Seleziona l'auto:";
    newElem.value = "";
    autChooser.add(newElem, where);
    if (choice != "") {
        for (var i = 0; i < db.length; i++) {
            newElem = document.createElement("option");
            newElem.text = db[i].text;
            newElem.value = db[i].value;
            autChooser.add(newElem, where);
        }
    }
}

</script>
Con questo script in base al valore Autista mi da i collegamenti Auto, se in {value:"2", text:"Fiat 500 - BB 111 BB"} voglio mettere un selected come faccio?