/**
 * jQuery.rollover
 *
 * @version    1.0.3
 * @author     Hiroshi Hoaki <rewish.org@gmail.com>
 * @copyright  2010 Hiroshi Hoaki
 * @license    http://rewish.org/license/mit The MIT License
 * @link       http://rewish.org/javascript/jquery_rollover_plugin
 *
 * Usage: */
jQuery(function($) {
	// 基本
	$('#nav a img').rollover();

	// inputもいける
	$('form input:image').rollover();

	// 複数指定も楽々
	$('#navi a img, form input:image, .over').rollover();

});

jQuery.fn.rollover = function(suffix) {
	suffix = suffix || '_on';
	var check = new RegExp(suffix + '\\.\\w+$');
	return this.each(function() {
		var img = jQuery(this);
		var src = img.attr('src');
		if (check.test(src)) return;
		var _on = src.replace(/\.\w+/, suffix + '$&');
		jQuery('<img>').attr('src', _on);
		img.hover(
			function() { img.attr('src', _on); },
			function() { img.attr('src', src); }
		);
	});
};