function execBanner(svc)
{
  var frm=document.bannerForm;
  var msk;
  var uid;
  var s;
  var len;
  var msg="";
  msk= getCookie("cktimbuktu");
  if (msk != null) msk=msk.toString();
  else msk="";
  frm.TEXT_MASK.value = msk;
  uid= getCookie("ckuser");
  if (uid != null) uid=uid.toString();
  else uid="";
  frm.TEXT_USERNAME.value = uid;
  s=frm.TEXT_BANNER.value;
  if (s != null) s=s.toString();
  else s="";
  len=s.length;
  if (len < 5) msg=msg+"banner file name";
  else {
  s=s.substring(len-4,len);
  if (s == ".jpg" || s == ".png" || s == ".gif") {}
  else { msg=msg+"unsupported banner file type"; }
  }
  frm.TEXT_MESSAGE.value = msg;
  if (msg.length > 0) {
  if (nBrowserType == 1) {
  window.alert("Check parameters: "+msg);
  return false;
  }
  }
  return true;
}