function showonlyone(thechosenone) {
      var advdetails = document.getElementsByTagName("div");
            for(var x=0; x<advdetails.length; x++) {
                  name = advdetails[x].getAttribute("name");
                  if (name == 'advdetails') {
                        if (advdetails[x].id == thechosenone) {
                        advdetails[x].style.display = 'block';
                  }
                  else {
                        advdetails[x].style.display = 'none';
                  }
            }
      }
}