var init_image
var count;
var int_time;
var new_image;
var img_width;
var img_height;

//インターバル時間セット[ms]
int_time = 20000;

//画像サイズ
img_width = 800;
img_height = 210;



function init() {
    init_image =  $("image").src;
    count = 1;
    setInterval(nextImage, int_time);
}

function nextImage() {
    if (count == 1) {
         new_image = "http://www.itosekkei.ne.jp/common/images/top_main_night_image.jpg"
         count = 2;
    } else {
         new_image = init_image;
         count = 1;
    }
    new Effect.Fade("image", {from: 1.0, to: 0.4, duration: 2.5, afterFinish: imageAppear});
}


function imageAppear() {
   	new Effect.Appear("image", {from: 0.4, to: 1.0, duration: 2.5});
    $("image").src = new_image;
    $("image").width = img_width;
    $("image").height = img_height;    
}