if (document.images) {
  homeHiLite = new Image(168, 20);
  homeHiLite.src = "ehovr.gif";
  homeOrig = new Image(168, 20);
  homeOrig.src = "ehout.gif";
    
  prodHiLite = new Image(168, 20);
  prodHiLite.src = "spovr.gif";
  prodOrig = new Image(168, 20);
  prodOrig.src = "spout.gif";
    
  partHiLite = new Image(168, 20);
  partHiLite.src = "ssovr.gif";
  partOrig = new Image(168, 20);
  partOrig.src = "ssout.gif";
    
  contHiLite = new Image(168, 20);
  contHiLite.src = "smovr.gif";
  contOrig = new Image(168, 20);
  contOrig.src = "smout.gif";
}

function hiLiteOn(imgName) {
  if (document.images) {
    hiLiteImage = eval(imgName + "HiLite.src");
    document [imgName].src = hiLiteImage
  }
}
  
function hiLiteOff(imgName) {
  if (document.images) {
    originalImage = eval(imgName + "Orig.src")
    document [imgName].src = originalImage
  }
}