arr = ["Apollo", "Bacchus", "Ianus", "Iupiter", "Mars", "Mercurius"];
Array.prototype.sucher = function(w) {
        trace(this);
        var resD = [];
        var resC = [];
        for (i in this) {
                if ((this[i].indexOf(w, 0) != -1)) {
                        resD.push(this[i]);
                        resC.push(i);
                }
        }
        if (resD.length == 0) {
                return (-1);
        } else {
                resC.shift();
                resC = resC.reverse();
                return (resC);
        }
};
trace(arr.sucher("us"));