var Class_Menu = {
	constructor : function (){
		
		var elem=Class_Menu.getElementByClass(document,'div','head_block3');
		elem.onmouseover=Class_Menu.swap(elem);
		
	},
	swap : function(obj) {
		if (Class_Menu.isTitle()) {anim_img='/image/main.gif'; stat_img='/image/img_head3.gif';} 
		else {anim_img='/image/main.gif'; stat_img='/image/img_head3.gif';}
		if (!obj.swapp) {
			obj.style.backgroundImage='url('+anim_img+')';obj.style.backgroundRepeat='no-repeat';
			if (Class_Menu.isTitle()) obj.style.backgroundPosition='5px -10px'; 
			else obj.style.backgroundPosition='5px -15px'; 
			obj.swapp=true;
		}else{
			obj.style.backgroundImage='url('+stat_img+')';obj.style.backgroundPosition='bottom'; obj.swapp=false;
		}
	},
	getElementByClass : function (el, tagName, className) {
	var els = el.getElementsByTagName(tagName);
	for (var i = 0; i < els.length; i++) {
    	if ((new RegExp(className)).test(els[i].className)) {
			return els[i];
		}
	}
	return null;
},
	getURL : function () {
		return document.location.pathname;
	},
	isTitle : function () {
		var is = Class_Menu.getURL();
		if (is=='/') return true;
		return false;
	}
};