<!--
/* check first */
if (document.images)
{
/* preload */
jbup1 = new Image();
jbup1.src = "../obg/jbup1.png";
jbup2 = new Image();
jbup2.src = "../obg/jbup2.png";
jbtop1 = new Image();
jbtop1.src = "../obg/jbtop1.png";
jbtop2 = new Image();
jbtop2.src = "../obg/jbtop2.png";
jbbac1 = new Image();
jbbac1.src = "../obg/jbbac1.png";
jbbac2 = new Image();
jbbac2.src = "../obg/jbbac2.png";
jbhub1 = new Image();
jbhub1.src = "../obg/jbhub1.png";
jbhub2 = new Image();
jbhub2.src = "../obg/jbhub2.png";
jbhom1 = new Image();
jbhom1.src = "../obg/jbhom1.png";
jbhom2 = new Image();
jbhom2.src = "../obg/jbhom2.png";
jbmus1 = new Image();
jbmus1.src = "../obg/jbmus1.png";
jbmus2 = new Image();
jbmus2.src = "../obg/jbmus2.png";
jbtec1 = new Image();
jbtec1.src = "../obg/jbtec1.png";
jbtec2 = new Image();
jbtec2.src = "../obg/jbtec2.png";
jbtar1 = new Image();
jbtar1.src = "../obg/jbtar1.png";
jbtar2 = new Image();
jbtar2.src = "../obg/jbtar2.png";
jbcon1 = new Image();
jbcon1.src = "../obg/jbcon1.png";
jbcon2 = new Image();
jbcon2.src = "../obg/jbcon2.png";
jbabo1 = new Image();
jbabo1.src = "../obg/jbabo1.png";
jbabo2 = new Image();
jbabo2.src = "../obg/jbabo2.png";
jbmap1 = new Image();
jbmap1.src = "../obg/jbmap1.png";
jbmap2 = new Image();
jbmap2.src = "../obg/jbmap2.png";
}

function On(imageName)
{
 if (document.images)
  {
   document[imageName].src = eval(imageName+"2.src");
  }
}
function Off(imageName)
{
 if (document.images)
  {
   document[imageName].src = eval(imageName+"1.src");
  }
}
// -->