function(links) {
    var result = [];

    var getParentLink = function(link) {
        var result = null;

        var hrefSplit = link.href.split('_');
        var parentHref = hrefSplit.splice(0, hrefSplit.length-1).join('_');

        for (var i = 0; i < links.length; i++) {
            if (links[i].href == parentHref)
                result = links[i];
        }

        return result;
    };

    var getLinkIndexInResult = function(link) {
        for (var i = 0; i < result.length; i++) {
            if (result[i].name == link.name)
                return i;
        }
    };

    // register parents
    for (var i = 0; i < links.length; i++) {
        var parent = getParentLink(links[i]);

        if (!parent) result.push(links[i]);
    }

    // register children
    for (var i = 0; i < links.length; i++) {
        var parent = getParentLink(links[i]);
        if (!parent) continue;

        var parentIndex = getLinkIndexInResult(parent);
        if (!result[parentIndex].children) result[parentIndex].children = [];
        result[parentIndex].children.push(links[i]);
    };

    return result;
};