(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 id="tooltip" class="tipsy"><div class="tipsy-inner"/></div>');
					$.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 + 25, 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' }).stop().animate({ opacity:0.8 }, "slow");
				} 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');
					tip.remove();
				}, 0);

			});
			
		});
		
	};
	
	$.fn.tipsy.elementOptions = function(ele, options) {
		return $.metadata ? $.extend({}, options, $(ele).metadata()) :options;
	};
	
	$.fn.tipsy.defaults = {
		fade:true,
		fallback:'',
		gravity:'s',
		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);