function ValidatePrxInputForm(frm)
{
  var cbx1 = frm.elements["PrxInputControl1_checkProperties_0"];
  var cbx2 = frm.elements["PrxInputControl1_checkProperties_1"];
  var cbx3 = frm.elements["PrxInputControl1_checkProperties_2"];
  if (!cbx1.checked && !cbx2.checked && !cbx3.checked)
  {
    alert("Please select a type of location to search for.");
    return false;
  }
  return true;
}