function reserved_friends(presentid) {
var url = '/cadouri/reserved_friends.php';
var params = 'present='+presentid;
var ajax = new Ajax.Updater(
{success: 'present-'+presentid},
url,
{method: 'get', parameters: params, onFailure: reportError});
}

function reportError(request) {
$F('present') = "Error";
}