A little CSS and jQuery is enough to rebuild this feature. Take a look at my jsfiddle.
jQuery Snippet
$('#opener').on('click', function() {
var panel = $('#slide-panel');
if (panel.hasClass("visible")) {
panel.removeClass('visible').animate({'margin-left':'-300px'});
} else {
panel.addClass('visible').animate({'margin-left':'0px'});
}
return false;
});
Full example: http://jsfiddle.net/9Le8X/2/
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