function toggleLayer( namedLayer, searchstr )
{
  var elem, vis;

  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( namedLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[namedLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[namedLayer];

  // Check if the cloud has been built by evaluating contents of div -- 
  // div with id=cloud always contains a period before cloud is built 
  if (elem.firstChild.nodeValue=="Loading...") { buildCloud( escape(searchstr) ) }

  vis = elem.style;

  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function addSearchTerm( word ) {
	document.search.terms.value += word;
}

function buildCloud( searchstr ) {
        var params = 'terms='+unescape( searchstr );
        new Ajax.Updater('cloud', 'modules/cloud.xqy', { method:'get', parameters:params, asynchronous:true});
}