function imgChange(k) {
    imgXmas = new Array();
    imgTA05 = new Array();
    if(k==1){
        imgXmas[0] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_564.jpg";
        imgXmas[1] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_565.jpg";
        imgXmas[2] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_566.jpg";
        n = Math.floor(Math.random()*imgXmas.length);
        document.write('<a href="http://item.rakuten.co.jp/rc-rainbow/c/0000001723/">');
        document.write('<img src="'+imgXmas[n]+'" width="576" height="100" border="0" alt="Merry Christmas 2008☆from Rainbow" />');
        document.write('</a>');
    }
    if(k==2){
        imgTA05[0] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_494.jpg";
        imgTA05[1] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_479.jpg";
        imgTA05[2] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/feature_149.jpg";
        imgTA05[3] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/feature_136.jpg";
        imgTA05[4] = "http://image.rakuten.co.jp/rc-rainbow/cabinet/mcd_550.jpg";
        n = Math.floor(Math.random()*imgTA05.length);
        document.write('<a href="http://item.rakuten.co.jp/rc-rainbow/c/0000000196/">');
        document.write('<img src="'+imgTA05[n]+'" width="571" height="90" border="0" alt="タミヤ TA05　高効率ベルト4WD！" vspace="2" /><br />');
        document.write('【 <b>タミヤ TA05</b>】　モーターと回転方向を揃えることで高効率化　初級者から上級者まで幅広く使えるベルトドライブ');
        document.write('</a>');
    }
}