function nfrcOver() {
  x = this.getElementsByTagName('img')[1];
  x.src = x.src.replace('triangle','triangle_1');
}

function nfrcOut() {
  x = this.getElementsByTagName('img')[1];
  x.src = x.src.replace('triangle_1','triangle');
}

function nfrcHighlight() {
  // Highlight fix for National Fenestration Rating Council triangle image
  var x = document.getElementById('nfrc');
  if (!x) return false;
  x = x.getElementsByTagName('a')[0];
  x.onmouseover = nfrcOver;
  x.onmouseout = nfrcOut;
}

addOnloadHandler(nfrcHighlight);