function ab() {
    var i, x, tB, j = 0, tA = new Array, arg = ab.arguments;
    if (document.getElementsByTagName) {
        for (i = 4; i < arg.length; i++) {
            tB = document.getElementsByTagName(arg[i]);
            for (x = 0; x < tB.length; x++) {
                tA[j] = tB[x];
                j++;
            }
        }
        for (i = 0; i < tA.length; i++) {
            if (tA[i].className) {
                if (tA[i].id == arg[1]) {
                    if (arg[0] == 1) {
                        tA[i].className = tA[i].className == arg[3] ? arg[2] : arg[3];
                    } else {
                        tA[i].className = arg[2];
                    }
                } else if (arg[0] == 1 && arg[1] == "none") {
                    if (tA[i].className == arg[2] ||
                        tA[i].className == arg[3]) {
                        tA[i].className = tA[i].className == arg[3] ? arg[2] : arg[3];
                    }
                } else if (tA[i].className == arg[2]) {
                    tA[i].className = arg[3];
                }
            }
        }
    }
}