function smartRollover() {
	if(document.getElementsByTagName) {
		var images = document.getElementsByTagName("img");

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

if(window.addEventListener) {
	window.addEventListener("load", smartRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", smartRollover);
}

MM_preloadImages(
'http://club-ener.com/images/menu-flow_on.gif',
'http://club-ener.com/images/enter_on.gif',
'http://club-ener.com/images/menu-akekure_on.gif',
'http://club-ener.com/images/menu-column_on.gif',
'http://club-ener.com/images/menu-consulting_on.gif',
'http://club-ener.com/images/menu-contact_on.gif',
'http://club-ener.com/images/menu-web_on.gif',
'http://club-ener.com/images/menu-works_on.gif',
'http://club-ener.com/images/tawashi_on.jpg',
'http://club-ener.com/images/access_on.jpg',
'http://club-ener.com/images/tel_contact_on.jpg',
'http://club-ener.com/images/company_on.gif',
'http://club-ener.com/images/contact_on.gif',
'http://club-ener.com/images/faq_on.gif',
'http://club-ener.com/images/home_on.gif',
'http://club-ener.com/images/recruit_on.gif',
'http://club-ener.com/images/contact_on.gif'
);

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}