Theres a BBCODE we use.
More than welcome to add to your pack.
title: Spoiler
tag: sp
replacement:
Code:
<span style="color: #ffffff; background: #ffffff;" onmouseover="this.style.color='#4096d4';" onmouseout="this.style.color='#ffffff';">{param}</span>
example:
Code:
[sp]Hide your message[/sp]
description: This tag changes the text into a coloured box which is unreadable. If you hover the mouse over the message box, the text will magically appear.