commit f49cbc768ecfecce3c87afdeecbbfdfcd68fee01
Author: Kohsuke Kawaguchi <kk@kohsuke.org>
Date:   Thu Mar 1 18:47:48 2012 -0800

    Imported prestine 1.5.1.1
    
    ... from http://www.prototypejs.org/assets/2007/6/20/prototype.js
    
    Originally-Committed-As: 9a2891057d64a824cc2cd1b155a60fdf3fdce2a1