function numbersonly(myfield, e, dec) {
    var key;
    var keychar;
    if (window.event) {
        key = window.event.keyCode;
    }
    else if (e) {
        key = e.which;
    }
    else {
        return true;
    }
    keychar = String.fromCharCode(key);

    // control keys
    if ((key == null) || (key == 0) || (key == 8) || (key == 9) || (key == 13) || (key == 27)) {
        return true;
    }
    // numbers
    else if ((("0123456789").indexOf(keychar) > -1)) {
        return true;
    }

    // decimal point jump
    else if (dec && (keychar == ".")) {
        //myfield.form.elements[dec].focus();
        return true;
    }
    else {
        return false;
    }
}