(function($) {

    $.fn.tipsy = function(options) {

        options = $.extend({}, $.fn.tipsy.defaults, options);

        return this.each(function() {

            var opts = $.fn.tipsy.elementOptions(this, options);

            $(this).hover(function() {

                $.data(this, 'cancel.tipsy', true);

                var tip = $.data(this, 'active.tipsy');

                if (!tip) {

                    tip = $('<div class="tipsy"><div class="tipsy-inner"/></div>');

                    tip.css({position: 'absolute', zIndex: 100000});

                    $.data(this, 'active.tipsy', tip);

                }

                if ($(this).attr('title') || typeof($(this).attr('original-title')) != 'string') {

                    $(this).attr('original-title', $(this).attr('title') || '').removeAttr('title');

                }

                var title;

                if (typeof opts.title == 'string') {

                    title = $(this).attr(opts.title == 'title' ? 'original-title' : opts.title);

                } else if (typeof opts.title == 'function') {

                    title = opts.title.call(this);

                }

                tip.find('.tipsy-inner')[opts.html ? 'html' : 'text'](title || opts.fallback);

                var pos = $.extend({}, $(this).offset(), {width: this.offsetWidth, height: this.offsetHeight});

                tip.get(0).className = 'tipsy'; // reset classname in case of dynamic gravity

                tip.remove().css({top: 0, left: 0, visibility: 'hidden', display: 'block'}).appendTo(document.body);

                var actualWidth = tip[0].offsetWidth, actualHeight = tip[0].offsetHeight;

                var gravity = (typeof opts.gravity == 'function') ? opts.gravity.call(this) : opts.gravity;

                switch (gravity.charAt(0)) {

                    case 'n':

                        tip.css({top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2}).addClass('tipsy-north');

                        break;

                    case 's':

                        tip.css({top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2}).addClass('tipsy-south');

                        break;

                    case 'e':

                        tip.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth}).addClass('tipsy-east');

                        break;

                    case 'w':

                        tip.css({top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width}).addClass('tipsy-west');

                        break;

                }

                if (opts.fade) {

                    tip.css({opacity: 0, display: 'block', visibility: 'visible'}).animate({opacity: 0.8});

                } else {

                    tip.css({visibility: 'visible'});

                }

            }, function() {

                $.data(this, 'cancel.tipsy', false);

                var self = this;

                setTimeout(function() {

                    if ($.data(this, 'cancel.tipsy')) return;

                    var tip = $.data(self, 'active.tipsy');

                    if (opts.fade) {

                        tip.stop().fadeOut(function() { $(this).remove(); });

                    } else {

                        tip.remove();

                    }

                }, 100);

            });

        });

    };

    // Overwrite this method to provide options on a per-element basis.

    // For example, you could store the gravity in a 'tipsy-gravity' attribute:

    // return $.extend({}, options, {gravity: $(ele).attr('tipsy-gravity') || 'n' });

    // (remember - do not modify 'options' in place!)

    $.fn.tipsy.elementOptions = function(ele, options) {

        return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;

    };

    $.fn.tipsy.defaults = {

        fade: false,

        fallback: '',

        gravity: 'n',

        html: false,

        title: 'title'

    };

    $.fn.tipsy.autoNS = function() {

        return $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? 's' : 'n';

    };

    $.fn.tipsy.autoWE = function() {

        return $(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? 'e' : 'w';

    };

})(jQuery);