function showRegion(region) {
    var tbl_spaces = document.getElementById('tbl_spaces');              
    var table_rows = tbl_spaces.getElementsByTagName("tr");
    
    searchSelect('none'); // clears any previously selected checkboxes
    
    for(i = 0; i < table_rows.length; i++) {
      if(table_rows[i].className == region || table_rows[i].className == "persistent") {
        table_rows[i].style.display = '';
      } else {
        table_rows[i].style.display = 'none';
      }
    }
  }
  
  function searchSelect(option) {
    var tbl_spaces = document.getElementById('tbl_spaces');              
    var table_rows = tbl_spaces.getElementsByTagName("tr");
    var form = document.frm_search;
    
    for(i = 0; i < form.elements.length; i++) {
      if(form.elements[i].type == "checkbox" && form.elements[i].parentNode.parentNode.style.display == '') {
        (option == 'all') ? form.elements[i].checked = true : form.elements[i].checked = false;
      }
    }
  }
  
  function trim(str) { return str.replace(/^\s*|\s*$/g,""); }
  
  addLoadEvent(function() {
    
  });