function citychanged () {
  AjaxUpdMode = "json";
  AjaxUpdTarget = "s_venue";
  var target = document.getElementById("s_venue");
  var source = document.getElementById("s_city");
  target.options.length=1;
  var cityGET = '&city='+source.value;
  if (source.value=="") cityGET = "";
  AjaxObj.Open("search_ajax.php", '?field=venue'+cityGET, AjaxUpd);
  target.disabled=true;
 } 
 
 function searchsubmit () {
  AjaxUpdMode = "";
  AjaxUpdTarget = "searchresults";
  var target = document.getElementById("searchresults");
  var sname = document.forms.searchform.s_name;
  var scity = document.getElementById("s_city");
  var svenue = document.getElementById("s_venue");
  var stime = document.getElementById("s_time");
  var syear = document.getElementById("s_year");
  var smonth = document.getElementById("s_month");
  var sday = document.getElementById("s_day");
  //s_name=&s_city=&s_time=365&s_venue=&s_year=2008&s_month=7&s_day=4
  target.innerHTML="";
  AjaxObj.Open("search.php", '?notemplate=1&s_name='+Url.encode(sname.value)+'&s_city='+Url.encode(scity.value)+'&s_time='+stime.value+'&s_venue='+Url.encode(svenue.value)+'&s_year='+syear.value+'&s_month='+smonth.value+'&s_day='+sday.value, AjaxUpd);
 }