Gold

1. You have to add this script to your source template, before the </head> tag:
<script src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">$(function(){$("#butToggle").click(function(){$('#dvt').toggle(1000);});});</script>

2.Next, add this CSS code before the </body> tag :

#dvt{width: 200px;height: 100px;border: solid 1px black;background-color:LightGrey;text-align:center; display:none;}

3.Finally ,create a HTML/JavaScript then add this code or you can add it to your entry too :
<div id="dvt">Put your codes, texts here...</div>
<button id="butToggle">Spread</button>


Look for the red code ,that is the place you need to put text and option the size of the box.
Save and have fun.