/**
 * Vibrate 1.0
 *
 * Makes an element vibrate
 *
 * Usage: jQuery('#my-annoying-ad').vibrate();
 *
 * @class vibrate
 * @param {Object} conf, custom config-object
 *
 * Copyright (c) 2008 Andreas Lagerkvist (andreaslagerkvist.com)
 * Released under a GNU General Public License v3 (http://creativecommons.org/licenses/by/3.0/)
 */
jQuery.fn.vibrate = function(conf) {
        var config = jQuery.extend({
                speed: 30,
                duration: 2000,
                frequency: 10000,
                spread: 3
        }, conf);

        return this.each(function() {
                var t = jQuery(this);

                var vibrate = function() {
                        var topPos = Math.floor(Math.random() * config.spread) - ((config.spread - 1) / 2);
                        var leftPos = Math.floor(Math.random() * config.spread) - ((config.spread - 1) / 2);
                        var rotate = Math.floor(Math.random() * config.spread - (config.spread - 1) / 2); // cheers to erik@birdy.nu for the rotation-idea
                        t.css({position: 'relative', left: leftPos +'px', top: topPos +'px', WebkitTransform: 'rotate(' +rotate +'deg)'});
                };

                var doVibration = function () {
                        var vibrationInterval = setInterval(vibrate, config.speed);

                        var stopVibration = function() {
                                clearInterval(vibrationInterval);
                                t.css({position: 'static'});
                        };

                        setTimeout(stopVibration, config.duration);
                };

                setInterval(doVibration, config.frequency);
        });
};