/**
 * Switches the search form to basic/advanced 
 */
function switchSearchForm(link, searchFormUrl, layer)
{
  try
  {
    var req = new jmAjax();
  }
  catch (e)
  {
    alert("Error initializing AJAX request: " + e);
    return;
  }
  
  // some DOM around the link
  req.searchFormLink = link;
  req.formLayer = link.ownerDocument.getElementById(typeof(layer) != "undefined" ? layer : 'searchForm');
  
  var loadingLayer = link.nextSibling;
  
  // show "loading..." and hide the link
  /*if (loadingLayer != null)
  {
    req.searchFormLink.style.display = "none";
    loadingLayer.innerHTML = "Loading...";
  }
  else
  {
    alert("Cannot find layer.");
  }*/
  
  req.callbackSuccess = function()
  {
    this.formLayer.innerHTML = this.responseText;        
  }
  
  req.get(searchFormUrl);
}

/* Section selection changed */
function sfSectionChanged(ss)
{
  var sec = parseInt(ss.value);
  
  // show/hide motoring only fields
  cn = Math.abs(sec) == 9 ? "sfMotorFldShown" : "sfMotorFldHidden";
  getObject('sfrmTrade').className = cn;
  if (getObject('sfrmYear'))
  {
    getObject('sfrmYear').className = cn;
  }
  
  // update categories drop down
  sfSetCategories(sec);
}

/* Populate categories */
function sfSetCategories(sec)
{
  var cl = getObject('cat').options;
  
  cl.length = 0;
  cl[cl.length] = new Option("All Categories", 0);
  
  if (sec > 0)
  {
    for (cid in categoryBySection[sec])
    {
      cl[cl.length] = new Option(categoryBySection[sec][cid], cid);
    }
  }
  else if (sec == -9)
  {
    cl[0] = new Option("Not Applicable", 0);
  }
}