<input type="button" id = "unblockButton" value = "click me" />
<select multiple="multiple" class="listBox" name="blockedList" id="blockedList">
<option title="John Doe (3)" value="21">John Doe (3)</option>
<option title="Jane Doe (4)" value="24">Jane Doe (4)</option>
<option title="Jason Doe (5)" value="23">Jason Doe (5)</option>
</select>