UI BOX LIST INJECTION DOUBLE CLICK ONLY
by bizamajig
HTML
<select id="one" multiple="multiple">
<option>one</option>
<option>two</option>
<option>three</option>
</select>
<select id="two" multiple="multiple">
</select>
JavaScript
$('#one option').dblclick(function() {
$(this).clone().appendTo("#two");
});