this article is  for vb4.2.0

STEPs 2.
go to Custom BB Codes > Add New BB Code

replacement

<div style="margin: 5px 20px 20px;"> <div class="smallfont" style="margin-bottom: 2px;"><b>Spoiler:</b>&nbsp;  <input value="Show" style="margin: 0px; padding: 0px; width: 45px; font-size: 10px;" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Hide'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'Show'; }" type="button" /> </div> <div class="alt2" style="border: 1px inset ; margin: 0px; padding: 6px;"> <div style="display: none;"> {param} </div> </div> </div>

Example: [Spoiler]Some Text[/Spoiler]
Description: Allows you to hide text or images.
Image Path: http://i47.tinypic.com/xpn88i.png
Use {option}: No
Remove Tag If Empty: Yes
Disable BB Code Within This BB Code: No
Disable Smilies Within This BB Code: No
Disable Word Wrapping Within This BB Code: No
Disable Automatic Link Parsing Within This BB Code: No