if (document.images) {

 // Start Setting

 var navEstimateon = new Image();
 navEstimateon.src = "/images/qa/nav_estimate_on.jpg";
 var navEstimateoff = new Image();
 navEstimateoff.src = "/images/qa/nav_estimate.jpg";

 var navRyoukinnon = new Image();
 navRyoukinnon.src = "/images/qa/nav_ryoukinn_on.jpg";
 var navRyoukinnoff = new Image();
 navRyoukinnoff.src = "/images/qa/nav_ryoukinn.jpg";

 var navNimotuon = new Image();
 navNimotuon.src = "/images/qa/nav_nimotu_on.jpg";
 var navNimotuoff = new Image();
 navNimotuoff.src = "/images/qa/nav_nimotu.jpg";

 var navOtheron = new Image();
 navOtheron.src = "/images/qa/nav_other_on.jpg";
 var navOtheroff = new Image();
 navOtheroff.src = "/images/qa/nav_other.jpg";



 // End Setting

}

// MouseOn Set
function On(name) {
 if (document.images) {
  document.images[name].src = eval(name + 'on.src');
 }
}

// MouseOut Set
function Off(name) {
 if (document.images) {
  document.images[name].src = eval(name + 'off.src');
 }
}