[Vlasenko Fedor]

function _get(key) {
    var uri = location.search, __GET = {}, q;
    if (uri) {
        var arr = uri.slice(1).split('&');
        for (var i = 0; i < arr.length; i++) {
            if (q = arr[i].split('='))
                __GET[q[0]] = decodeURIComponent(q[1]) || null;
        }
    }
    return key
            ? __GET.hasOwnProperty(key) ? __GET[key] : null
            : __GET;
}
alert(_get('fullname'));