Effect.Fold
Combination Effects > Effect.Fold
Reduce the element to its top then to left to make it disappear.
Examples
Effect.Fold('id_of_element');
Notes
Works safely with most Block Elements, except tables.
Demo
Source code of this demo
<div id="fold_demo" style="width:80px; height:80px; background:#ccc;"></div>
<ul>
<li><a href="#" onclick="Effect.Fold('fold_demo'); return false;">Click me for a demo!</a></li>
<li><a href="#" onclick="$('fold_demo').show(); return false;">Reset</a></li>
</ul>