function setupSearchCloud () {
    url = '/json/searchcloud.php';
    new Ajax.Request(url,
                     { method: 'get', onComplete: displayCloud });
}

function displayCloud (request) {
    eval('var results = ' + request.responseText);
    var html = '';

    for (var i = 0; i < results.length; i++) {
         html = html
              + '<li class="' + results[i]['rank'] + '">'
              + results[i]['item']
              + '</li>';
    }
    $('search-cloud').innerHTML = '<ul>' + html + '</ul>';
}