Q1265 How can I pass selections back and forth between two multiple select options, but have ALL the options (selected or otherwise) in the second select list passed back to the server?

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

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

function copySelected(fromObject,toObject) {
    for (var i=0, l=fromObject.options.length;i<l;i++) {
        if (fromObject.options[i].selected)
            addOption(toObject,fromObject.options[i].text,fromObject.options[i].value);
    }
    for (var i=fromObject.options.length-1;i>-1;i--) {
        if (fromObject.options[i].selected)
            deleteOption(fromObject,i);
    }
}

function copyAll(fromObject,toObject) {
    for (var i=0, l=fromObject.options.length;i<l;i++) {
        addOption(toObject,fromObject.options[i].text,fromObject.options[i].value);
    }
    for (var i=fromObject.options.length-1;i>-1;i--) {
        deleteOption(fromObject,i);
    }
}

function populateHidden(fromObject,toObject) {
    var output = '';
    for (var i=0, l=fromObject.options.length;i<l;i++) {
            output += escape(fromObject.name) + '=' + escape(fromObject.options[i].value) + '&';
    }
    alert(output);
    toObject.value = output;
}
//--></script>

<form name="myForm" onSubmit="populateHidden(document.myForm.select2,document.myForm.hidden1)">

<table><tr><td>

<p>
<select name="select1" multiple size="7">
<option value="0">zero
<option value="1">one
<option value="2">two
<option value="3">three
<option value="4">four
<option value="5">five
<option value="6">six
</select>
</p>

</td><td>

<p>
<input type="button" value=" > " onClick="if (document.images) copySelected(this.form.select1,this.form.select2)">
</p>
<p>
<input type="button" value=" < " onClick="if (document.images) copySelected(this.form.select2,this.form.select1)">
</p>
<p>
<input type="button" value=">>" onClick="if (document.images) copyAll(this.form.select1,this.form.select2)">
</p>
<p>
<input type="button" value="<<" onClick="if (document.images) copyAll(this.form.select2,this.form.select1)">
</p>

</td><td>

<select name="select2" multiple size="7">
</select>

</td></tr></table>

<input type="submit" value="Submit">
<input type="hidden" name="hidden1">

</form>