jquery.randomRotation.js

(function($) {
$.fn.randomRotation = function(i) {
	var c = 90;
	var prefix = $.browser.opera   ? "-o-":
	             $.browser.webkit  ? "-webkit-":
	             $.browser.mozilla ? "-moz-":
				         "";
	return this.each(function() {
		var pom = Math.random() > 0.5 ? 1 : -1
	        var rotation = pom * Math.floor(Math.random() * c);
		var origin = (pom > 0 ? "0% " : "100% ") + "100%"
		$(this).css(prefix + "transform-origin", origin)
                       .css(prefix + "transform", "rotate(" + rotation +"deg)");
	});
}
})(jQuery);