var searchpending = 0;
function SearchOnce() {
  if (! searchpending) {
    searchpending = 10;
    document.n.submit();
    ReduceTime();
  } else {
    alert('Your search is still in progress.\nPlease wait a few seconds before clicking search again');
  }
}
function ReduceTime() {
  if (searchpending) {
    --searchpending;
    setTimeout('ReduceTime()', 1000);
  }
}