num = 0;
//乱数発生（3ページ分）
num=Math.floor(3*Math.random());

jumpURL = new Array();
jumpURL[0] = "http://www.albert2005.co.jp/i-effect/";
jumpURL[1] = "http://www.albert2005.co.jp/social-reco/";
jumpURL[2] = "http://www.albert2005.co.jp/rtm/";


function changeImg(){
    //センターバナーの切り替え
    document.bannerC.src ="images/center/" + num + ".jpg";
    
    //右側バナーの切り替え
    if ( num == "0" ) {
        document.bannerR1.src ="images/right/1.jpg";
        document.bannerR2.src ="images/right/2.jpg";
    } else if ( num == "1") {
        document.bannerR1.src ="images/right/0.jpg";
        document.bannerR2.src ="images/right/2.jpg";
    } else if ( num == "2") {
        document.bannerR1.src ="images/right/0.jpg";
        document.bannerR2.src ="images/right/1.jpg";
    }

}

function jump(){
    //センターバナーの遷移先
    window.open(jumpURL[num], "_blank");
}

function jumpR1(){
    //右側バナー1の遷移先
    if ( num == "0" ) {
        window.open(jumpURL[1], "_blank");
    } else {
        window.open(jumpURL[0], "_blank");
    }
}

function jumpR2(){
    //右側バナー1の遷移先
    if ( num == "2" ) {
        window.open(jumpURL[1], "_blank");
    } else {
        window.open(jumpURL[2], "_blank");
    }
}