var json = {
    "movies": {
        "details": [{
            "title": "apple",
            "gerne": 1999},
        {
            "title": "lofasz",
            "gerne": 2000}]
    }
};
$.each(json.movies.details, function(i, v) {
    if (v.title == "lofasz") {
        alert(v.gerne);
        return;
    }
});