function on(img_name) {
  var s=document[img_name].src;
  var ss=s.substring(0,(s.length - 4))+'_a'+s.substring((s.length - 4),s.length);
  document[img_name].src=ss;
}

function off(img_name) {
  var s=document[img_name].src;
  var ss=s.substring(0,(s.length - 6))+s.substring((s.length - 4),s.length);
  document[img_name].src=ss;
}

function popUpFrame(url) {
  var win = window.open(url);
}

function sizedPopUpFrame(url) {
  var windowprops = "location=no,scrollbars=no,menubars=no,toolbars=no,resizable=yes" + ",width=500,height=370";
  popup = window.open(url,"MenuPopup",windowprops);
}

function galleryPopUp(url) {
  var windowprops = "location=no,scrollbars=no,menubars=no,toolbars=no,resizable=yes" + ",width=480,height=500";
  popup = window.open(url,"MenuPopup",windowprops);
}

function galleryPopUp2(url) {
  var windowprops = "location=no,scrollbars=yes,menubars=no,toolbars=yes,resizable=yes" + ",width=600,height=500";
  popup = window.open(url,"MenuPopup",windowprops);
}