// popup
function subWin(url, width, height, scrl, resize){
	win = window.open(url, "subwin","width=" + width + ",height=" + height + ",toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=" + scrl + ",resizable=" + resize);
}

// rollover
window.onload = function(){

	var conf = {
		className : 'btn',	// クラス名
		postfix : '_o'		// マウスオン時の画像のファイル名
	};
	var imgNodeList = getElementsByClassName(conf.className);
	var node;
	for (var i=0, len=imgNodeList.length; i<len; i++) {
		node = imgNodeList[i];
		node.originalSrc = node.src;
		node.rolloverSrc = node.originalSrc.replace(/(\.gif|\.jpg|\.png)/,
			conf.postfix+"$1");
		preloadImage(node.rolloverSrc);
		node.onmouseover = function() {
			this.src = this.rolloverSrc;
		};
		node.onmouseout = function() {
			this.src = this.originalSrc;
		};
	}
};

function getElementsByClassName(name) {
	var elements = [];
	var allElements = document.getElementsByTagName('*');
	var re = new RegExp("(^|\\s)" + name + "($|\\s)");
	for (var i=0, len=allElements.length; i<len; i++) {
		if (allElements[i].className.match(re)) {
			elements.push(allElements[i]);
		}
	}
	return elements;
}

preloadedImages = [];
function preloadImage(url) {
	var p = preloadedImages;
	var l = p.length;
	p[l] = new Image();
	p[l].src = url;
}