oLahav said:
Coolest thing ever!
Hide and reveal text:
<a href='#' onclick="$('my_text').toggle();">Reveal the text.</a>
<div id='my_text' style='display: none;'>
This text is no longer hidden!
</div>
You can also reveal Math Equations:
<a href='#' onclick="$('my_math').toggle();">Reveal the math answer.</a>
<div id='my_math' style='display: none;'>
<math>\frac{2}{4}=0.5</math>
</div>