(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 ($(this).attr('tipsy') || typeof($(this).attr('original-title')) != 'string') {
					$(this).attr('original-title', $(this).attr('tipsy') || '').removeAttr('tipsy');
				}

				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 ( title ) {				
					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: true,
			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);