if (document.images) {

  img_nav_sub3_1on = new Image();
  img_nav_sub3_1on.src = "../_img/nav_sub3_1over.gif";
  img_nav_sub3_2on = new Image();
  img_nav_sub3_2on.src = "../_img/nav_sub3_2over.gif"; 
  img_nav_sub3_3on = new Image();
  img_nav_sub3_3on.src = "../_img/nav_sub3_3over.gif";
  img_nav_sub3_4on = new Image();
  img_nav_sub3_4on.src = "../_img/nav_sub3_4over.gif";
  img_nav_sub3_5on = new Image();
  img_nav_sub3_5on.src = "../_img/nav_sub3_5over.gif";
  img_nav_sub3_6on = new Image();
  img_nav_sub3_6on.src = "../_img/nav_sub3_6over.gif";
  img_nav_sub3_7on = new Image();
  img_nav_sub3_7on.src = "../_img/nav_sub3_7over.gif";
  img_nav_sub3_8on = new Image();
  img_nav_sub3_8on.src = "../_img/nav_sub3_8over.gif";
  img_nav_sub3_9on = new Image();
  img_nav_sub3_9on.src = "../_img/nav_sub3_9over.gif";

  img_nav_sub3_1off = new Image();
  img_nav_sub3_1off.src = "../_img/nav_sub3_1off.gif";
  img_nav_sub3_2off = new Image();
  img_nav_sub3_2off.src = "../_img/nav_sub3_2off.gif";
  img_nav_sub3_3off = new Image();
  img_nav_sub3_3off.src = "../_img/nav_sub3_3off.gif";
  img_nav_sub3_4off = new Image();
  img_nav_sub3_4off.src = "../_img/nav_sub3_4off.gif";
  img_nav_sub3_5off = new Image();
  img_nav_sub3_5off.src = "../_img/nav_sub3_5off.gif";
  img_nav_sub3_6off = new Image();
  img_nav_sub3_6off.src = "../_img/nav_sub3_6off.gif";
  img_nav_sub3_7off = new Image();
  img_nav_sub3_7off.src = "../_img/nav_sub3_7off.gif";
  img_nav_sub3_8off = new Image();
  img_nav_sub3_8off.src = "../_img/nav_sub3_8off.gif";
  img_nav_sub3_9off = new Image();
  img_nav_sub3_9off.src = "../_img/nav_sub3_9off.gif";

}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}