<!-- 
var cookie_name    = "hogehoge"; // 任意のクッキー名 
var cookie_exptime = 100;        // クッキーの有効期限（日） 

var images  = new Array(); 
images[0] = "../img/food_drink/top_img1.jpg"; //初回表示の画像 
images[1] = "../img/food_drink/top_img2.jpg"; 
images[2] = "../img/food_drink/top_img3.jpg"; 

//-------------------------- 

var img_num = images.length; 

function getcookie(){ 
    if(!document.cookie.indexOf(cookie_name,0)){ 
        return Math.floor(Math.random() * img_num) 
    }else{ 
        setCookie(); 
        return 0; 
    } 
} 
function setCookie(){ 
    exptime = new Date(); 
    exptime.setTime(exptime.getTime()+60*60*24*cookie_exptime); 
    data = cookie_name+"=;expires=" + exptime.toGMTString() + ";"; 
    document.cookie=data; 
    return true; 
} 
// -->