$("#Manufacturer").change(function() {
    if (this.value != 0) {
        switch (this.value) {
            case "all":
                window.location = "Devices.aspx";
                break;
            case "datacards":
                window.location = "Devices.aspx?showdatacards=true";
                break;
            default:
                window.location = "Devices.aspx?manufacturerId=" + this.value;
                break;
        };
    };
});