/**
 * common.js
 *
 * @version    1.10
 * @updated    2009-08-05
 * @author     takumi osada <http://groovy-times.com>
 * @copyright  Copyright (c) 2009 GROOVY-TIMES
 * @license    MIT License <http://www.opensource.org/licenses/mit-license.php>
 *
 * @see        http://book.mycom.co.jp/book/978-4-8399-2237-5/978-4-8399-2237-5.shtml
 */ 

/* -----------------------------------------------------------------------*/
// addClass
/* -----------------------------------------------------------------------*/
function addClass(element,value) {
	if(!element.className) {
		element.className = value;
	} else {
		newClassName = element.className;
		newClassName += ' ';
		newClassName += value;
		element.className = newClassName;
	}
}

/* -----------------------------------------------------------------------*/
// addLoadEvent
/* -----------------------------------------------------------------------*/
function addLoadEvent(func) {
	var oldonload = window.onload;
	if(typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}