I have created a drop down menu with animals. But what I wanna do now is, after I have selected one of the animals from the drop down, can I 'display' a checkbox button? Like... hide it initially and then after I have select one of the animals and click on it, the checkbox button will be visible? 

I can only do on the code for drop down menu... 

```
    <li><a href="#" 
    onmouseover="mopen('m1')" 
    onmouseout="mclosetime()">animals</a>
    <div id="m1" 
        onmouseover="mcancelclosetime()" 
        onmouseout="mclosetime()">
    <a href="#">Dogs</a>
    <a href="#">Cats</a>
    <a href="#">Cow</a>
    <a href="#">Goats</a>
    <a href="#">Tiger</a>
    </div>
</li>

```

Help please!