function pop() {
  document.getElementById('popAd').style.display='block';
  return false
}
function hide() {
  document.getElementById('popAd').style.display='none';
  return false
}
if (document.images)
{
   Bimage0_normal        = new Image();
   Bimage0_normal.src    = "images/advert_C3_R1.jpg";
   Bimage0_over          = new Image();
   Bimage0_over.src      = "images/advert_C3_R1_1.jpg";
   Bimage1_normal        = new Image();
   Bimage1_normal.src    = "images/advert_C2_R3.jpg";
   Bimage1_over          = new Image();
   Bimage1_over.src      = "images/advert_C2_R3_1.jpg";
}

function switchimages(sName,nEvent) {
if (document.images)
 {
  if (nEvent == 0) sVal = 'normal';
  else if (nEvent == 1) sVal = 'over';
  else if (nEvent == 2) sVal = 'click';
  else return;
  sObj = eval(sName + '_' + sVal + ".src");
  if (document.images[sName])
  document.images[sName].src = sObj;
 }
}