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

		return this.each(function() {
			var opts = $.fn.tooltip.elementOptions(this, options);

			$(this).hover(function() {
				$.data(this, 'cancel.tooltip', true);
				var tip = $.data(this, 'active.tooltip');
				if (!tip) {
					tip = $('<div class="tooltip"><div class="tooltip-inner"/></div>');
					tip.css({position: 'absolute', zIndex: 88888888});
					$.data(this, 'active.tooltip', 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('.tooltip-inner')[opts.html ? 'html' : 'text'](title || opts.fallback);

				var pos = $.extend({}, $(this).offset(), {width: this.offsetWidth, height: this.offsetHeight});
				tip.get(0).className = 'tooltip'; // 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('tooltip-north');
					break;

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

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

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

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

			}, function() {
				$.data(this, 'cancel.tooltip', false);
				var self = this;
				setTimeout(function() {
					if ($.data(this, 'cancel.tooltip')) return;
					var tip = $.data(self, 'active.tooltip');
					if (opts.fade) {
						tip.stop().fadeOut(function() { $(this).remove(); });
					} else {
						tip.remove();
					}
				}, 0);

			});
		});
	};

	$.fn.tooltip.elementOptions = function(ele, options) {
		return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;
	};

	$.fn.tooltip.defaults = {
		fade: false,
		fallback: '',
		gravity: 'n',
		html: false,
		title: 'title'
	};

	$.fn.tooltip.autoNS = function() {
		return $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? 's' : 'n';
	};
    
	$.fn.tooltip.autoWE = function() {
		return $(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? 'e' : 'w';
	};

})(jQuery);

// tooltips
$(function() {
	$("[title!='']").tooltip({gravity: "n"});
	$("[gravity='s']").tooltip({gravity: "s"});
	$("[gravity='w']").tooltip({gravity: "w"});
	$("[gravity='e']").tooltip({gravity: "e"});
});