https://www.cm-vrsa.pt/templates/desenvolvimento/template_16/includes/js/jquery.opacityrollover.js

1/**
2 * jQuery Opacity Rollover plugin
3 *
4 * Copyright (c) 2009 Trent Foley (http://trentacular.com)
5 * Licensed under the MIT License:
6 *   http://www.opensource.org/licenses/mit-license.php
7 */
8;(function($) {
9	var defaults = {
10		mouseOutOpacity:   0.67,
11		mouseOverOpacity:  1.0,
12		fadeSpeed:         'fast',
13		exemptionSelector: '.selected'
14	};
15
16	$.fn.opacityrollover = function(settings) {
17		// Initialize the effect
18		$.extend(this, defaults, settings);
19
20		var config = this;
21
22		function fadeTo(element, opacity) {
23			var $target = $(element);
24			
25			if (config.exemptionSelector)
26				$target = $target.not(config.exemptionSelector);	
27			
28			$target.fadeTo(config.fadeSpeed, opacity);
29		}
30
31		this.css('opacity', this.mouseOutOpacity)
32			.hover(
33				function () {
34					fadeTo(this, config.mouseOverOpacity);
35				},
36				function () {
37					fadeTo(this, config.mouseOutOpacity);
38				});
39
40		return this;
41	};
42})(jQuery);