v_home = {
	f_getBgVal : function() {
		var v_cNameBg = "homeBg";
		var v_cNameFlag = "aFlag";

		var v_aFlag = f_getCookie(v_cNameFlag);
		var v_bgNum = f_entity(f_getCookie(v_cNameBg));

		if(!v_aFlag) {
			f_setCookie(v_cNameFlag, 1);
			f_setCookie(v_cNameBg, 1, "temporary");
			v_home.f_setBg(1);
		}

		if(v_aFlag && (!v_bgNum || v_bgNum == v_home.v_cNameBg)) {
			var v_setNum = Math.ceil(Math.random() * 3);
			f_setCookie(v_cNameBg, v_setNum, "temporary");
			v_home.f_setBg(v_setNum);
		}

		if(v_aFlag && v_bgNum) v_home.f_setBg(v_bgNum);
	},

	f_setBg : function(num) {
		document.getElementsByTagName("body")[0].setAttribute(v_class, "bg_0" + num);
	}
};

// onload ----------------------------------------
window.addEventListener("load", v_home.f_getBgVal, true);