function begin() {
  var a = "bobs your uncle";
  var b = document.getElementById("lock");
  b.innerHTML = "<form action='post.cgi' method='GET'><input name='answer'></form>";
  admin = a;
}
function unlock() {
  var answer = prompt("You want to build a stone wall around your 14'x22' yard. If the bricks are 6\" high & 6\" wide and 1' long.  Enter the number of bricks you will need to make a wall 6\" by 4' tall:");
  var req = null;
  try { req = new XMLHttpRequest(); } catch(e) {}
  if (!req) try { req = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {}
  if (!req) try { req = new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
  var url = 'http://ha.ckers.org/challenge2/answer.cgi?' + answer;
  req.open('GET', url, false);
  req.send(null);
  alert(req.responseText);
}