var sw=1;
    image=new Array(6);
    image[1]="img/banner-main-01.jpg";
    image[2]="img/banner-main-02.jpg";
    image[3]="img/banner-main-03.jpg";
    image[4]="img/banner-main-04.jpg";
    image[5]="img/banner-main-05.jpg";
    image[6]="img/banner-main-06.jpg";
    hyouji();
    function hyouji()
    {
      setTimeout("hyouji()",4000);
      document.banner.src=image[sw];
      sw=sw+1
      if (sw>6){sw=1;}
    }