if (document.images) {

     img1on = new Image();
     img1on.src = "images/bt_home_02.gif";

     img2on = new Image();
     img2on.src = "images/bt_security_02.gif";

     img3on = new Image();
     img3on.src = "images/bt_9001_02.gif";

     img4on = new Image();
     img4on.src = "images/bt_14001_02.gif";

     img5on = new Image();
     img5on.src = "images/bt_product_02.gif";

     img6on = new Image();
     img6on.src = "images/bt_seminar_02.gif";

     img7on = new Image();
     img7on.src = "images/bt_shiryou_02.gif";

     img8on = new Image();
     img8on.src = "images/bt_soudan_02.gif";


     img10on = new Image();
     img10on.src = "images/bt_gaiyou_02.gif";

     img11on = new Image();
     img11on.src = "images/bt_outline_02.gif";

     img12on = new Image();
     img12on.src = "images/bt_9001_gaiyou2.gif";

     img13on = new Image();
     img13on.src = "images/bt_merit2.gif";

     img14on = new Image();
     img14on.src = "images/bt_taisei2.gif";

     img15on = new Image();
     img15on.src = "images/bt_hituyousei2.gif";

     img16on = new Image();
     img16on.src = "images/bt_9001_consul2.gif";

     img17on = new Image();
     img17on.src = "images/bt_shoukai2.gif";

     img18on = new Image();
     img18on.src = "images/bt_faq2.gif";


     img1off = new Image();
     img1off.src = "images/bt_home.gif";

     img2off = new Image();
     img2off.src = "images/bt_security.gif";

     img3off = new Image();
     img3off.src = "images/bt_9001.gif";

     img4off = new Image();
     img4off.src = "images/bt_14001.gif";


     img5off = new Image();
     img5off.src = "images/bt_product.gif";

     img6off = new Image();
     img6off.src = "images/bt_seminar.gif";

     img7off = new Image();
     img7off.src = "images/bt_shiryou.gif";

     img8off = new Image();
     img8off.src = "images/bt_soudan.gif";


     img10off = new Image();
     img10off.src = "images/bt_gaiyou.gif";

     img11off = new Image();
     img11off.src = "images/bt_outline.gif";

     img12off = new Image();
     img12off.src = "images/bt_9001_gaiyou.gif";

     img13off = new Image();
     img13off.src = "images/bt_merit.gif";

     img14off = new Image();
     img14off.src = "images/bt_taisei.gif";

     img15off = new Image();
     img15off.src = "images/bt_hituyousei.gif";

     img16off = new Image();
     img16off.src = "images/bt_9001_consul.gif";

     img17off = new Image();
     img17off.src = "images/bt_shoukai.gif";

     img18off = new Image();
     img18off.src = "images/bt_faq.gif";
   }

function imgOn(imgName) {
     if (document.images) {
         document[imgName].src = eval(imgName + "on.src");
   }
}

function imgOff(imgName) {
     if (document.images) {
         document[imgName].src = eval(imgName + "off.src");
   }
}

function openWindow() {
window.open("","cara_window",'toolbar=0,location=0,scrollbars=1,width=600,height=640,resizable=1,left=200,top=30');
}