$(function() {
  $("#loadClubs").hide();

  $("#association").change(function() {
    if ($(this).val() == "") {
      $("#club,#swimnetId,#proceed").attr("disabled","disabled");
      $("#club").attr({ length: 1 })
    } else {
      $("#club,#swimnetId,#proceed").removeAttr("disabled");
      $.get("livequery.asmx/LoadClubsByState", { s: $(this).val() }, function(data) {
        var s = $("#club").attr({ length: 1 })[0];
        $("Club", data).each(function() {
          s.options[s.length] = new Option($("Name", this).text(), $("ClubId", this).text());
        });
      });
    }
  });
});