Q916 How can I dynamically sort the options in a select form field?

<script language="JavaScript"><!--
function sortOptions() {}
//--></script>

<script language="JavaScript1.1"><!--
function deleteOption(object,index) {
    object.options[index] = null;
}

function addOption(object,text,value) {
    var defaultSelected = false;
    var selected = false;
    var optionName = new Option(text, value, defaultSelected, selected)
    object.options[object.length] = optionName;
    object.options[object.length-1].selected = false;

}

function sortOptions(what) {
    var copyOption = new Array();
    for (var i=0;i<what.options.length;i++)
        copyOption[i] = new Array(what[i].value,what[i].text);

    copyOption.sort(function(a,b) { return a[0]-b[0]; });

    for (var i=what.options.length-1;i>-1;i--)
        deleteOption(what,i);

    for (var i=0;i<copyOption.length;i++)
        addOption(what,copyOption[i][1],copyOption[i][0])
}
//--></script>

<form>
<select name="selectName" multiple size="8">
<option value="8">apple
<option value="7">orange
<option value="6">pear
<option value="5">peach
<option value="4">banana
<option value="3">pineapple
<option value="2">cherry
<option value="1">grape
</select>

<input type="button" onClick="sortOptions(this.form.selectName)" value="Sort">

</form>