Simple implementation multi select drop down
<link href="multiple-select.css" rel="stylesheet"/>
<h2>Example of code</h2>
<select multiple="multiple" name="exemple" id="exemple">
<option value="1">test 1</option>
<option value="2">test 2</option>
<option value="3">test 3</option>
</select>
<script src="jquery.multiple.select.js"></script>
<script>
$('select').multipleSelect();
</script>
# The JS code needs to be just below the multi select