function chk_cookie(){
	var cookies = document.cookie.split("; ");
		for (var i = 0; i < cookies.length; i++){
			var str = cookies[i].split("=");
			if (str[0] == "COLOR_NAME"){
				cookie_color = str[1];
				break;
			}else{
				cookie_color = "#CC0000";
		}
	}
	chgBgColor(cookie_color);
}