//////////////////// ロールオーバー
function rollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName('img');

		for(var i=0; i < images.length; i++) {
			if(images[i].getAttribute('src').match('_off2.'))
			{
				images[i].onmouseover = function() {
					this.setAttribute('src', this.getAttribute('src').replace('_off2.', '_on.'));
				}
				images[i].onmouseout = function() {
					this.setAttribute('src', this.getAttribute('src').replace('_on.', '_off2.'));
				}
			}
		}
	}
}

function addEvent(obj, evType, fn){
 if (obj.addEventListener){
   obj.addEventListener(evType, fn, false);
   return true;
 } else if (obj.attachEvent){
   var r = obj.attachEvent("on"+evType, fn);
   return r;
 } else {
   return false;
 }
}
addEvent(window, 'load', rollover);