HTML5 autofocus plugin v0.2*
Copyright (c) 2009, Mike Taylor, http://miketaylr.com
MIT Licensed: http://www.opensource.org/licenses/mit-license.php

NOTE: As per the spec, only one element is permitted to have the
autofocus attribute, hence no .each()

http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#autofocusing-a-form-control

USAGE: $("[autofocus]").autofocus();

Thanks to paul_irish and temp01 for feedback and improvement suggestions.