https://www.hanabatakebokujo-store.com/common/js/jquery.rollover.js

1/**
2 * jQuery.rollover
3 *
4 * @version    1.0.4
5 * @author     Hiroshi Hoaki <[email protected]>
6 * @copyright  2010-2013 Hiroshi Hoaki
7 * @license    The MIT License
8 * @link       http://rewish.jp/blog/releases/jquery_rollover
9 *
10 * Usage:
11 * jQuery(document).ready(function($) {
12 *   // <img>
13 *   $('#nav a img').rollover();
14 *
15 *   // <input type="img">
16 *   $('form input:img').rollover();
17 *
18 *   // set suffix
19 *   $('#nav a img').rollover('_over');
20 * });
21 */
22jQuery.fn.rollover = function(suffix) {
23	suffix = suffix || '_on';
24	var check = new RegExp(suffix + '\\.\\w+$');
25	return this.each(function() {
26		var img = jQuery(this);
27		var src = img.attr('src');
28		if (check.test(src)) return;
29		var _on = src.replace(/\.\w+$/, suffix + '$&');
30		jQuery('<img>').attr('src', _on);
31		img.hover(
32			function() { img.attr('src', _on); },
33			function() { img.attr('src', src); }
34		);
35	});
36};