browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) ||
          ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )));

if (browser) {
  if (document.images) {

    // top nav normal image
    tnrm01 = new Image();
    tnrm01.src = "images/tnrm01.jpg";
    tnrm02 = new Image();
    tnrm02.src = "images/tnrm02.jpg";
    tnrm03 = new Image();
    tnrm03.src = "images/tnrm03.jpg";
    tnrm04 = new Image();
    tnrm04.src = "images/tnrm04.jpg";

    // top nav hover image
    thov01 = new Image();
    thov01.src = "images/thov01.jpg";
    thov02 = new Image();
    thov02.src = "images/thov02.jpg";
    thov03 = new Image();
    thov03.src = "images/thov03.jpg";
    thov04 = new Image();
    thov04.src = "images/thov04.jpg";

    // left nav normal image
    lnrm01 = new Image();
    lnrm01.src = "images/lnrm01.jpg";
    lnrm02 = new Image();
    lnrm02.src = "images/lnrm02.jpg";
    lnrm03 = new Image();
    lnrm03.src = "images/lnrm03.jpg";
    lnrm04 = new Image();
    lnrm04.src = "images/lnrm04.jpg";
    lnrm05 = new Image();
    lnrm05.src = "images/lnrm05.jpg";
    lnrm06 = new Image();
    lnrm06.src = "images/lnrm06.jpg";
    lnrm07 = new Image();
    lnrm07.src = "images/lnrm07.jpg";
    lnrm08 = new Image();
    lnrm08.src = "images/lnrm08.jpg";
    lnrm09 = new Image();
    lnrm09.src = "images/lnrm09.jpg";
    lnrm10 = new Image();
    lnrm10.src = "images/lnrm10.jpg";
    lnrm11 = new Image();
    lnrm11.src = "images/lnrm11.jpg";
    lnrm12 = new Image();
    lnrm12.src = "images/lnrm12.jpg";
    lnrm13 = new Image();
    lnrm13.src = "images/lnrm13.jpg";

    // left nav hover image
    lhov01 = new Image();
    lhov01.src = "images/lhov01.jpg";
    lhov02 = new Image();
    lhov02.src = "images/lhov02.jpg";
    lhov03 = new Image();
    lhov03.src = "images/lhov03.jpg";
    lhov04 = new Image();
    lhov04.src = "images/lhov04.jpg";
    lhov05 = new Image();
    lhov05.src = "images/lhov05.jpg";
    lhov06 = new Image();
    lhov06.src = "images/lhov06.jpg";
    lhov07 = new Image();
    lhov07.src = "images/lhov07.jpg";
    lhov08 = new Image();
    lhov08.src = "images/lhov08.jpg";
    lhov09 = new Image();
    lhov09.src = "images/lhov09.jpg";
    lhov10 = new Image();
    lhov10.src = "images/lhov10.jpg";
    lhov11 = new Image();
    lhov11.src = "images/lhov11.jpg";
    lhov12 = new Image();
    lhov12.src = "images/lhov12.jpg";
    lhov13 = new Image();
    lhov13.src = "images/lhov13.jpg";
  }
}

function changeImage(imgDocID,imgObjName) {
  document.images[imgDocID].src = eval(imgObjName + ".src");
}