function noNumbers(e) {
    var keynum;
    var keychar;
    var numcheck;
    if(window.event) // IE
    {
        keynum = e.keyCode;
    }
    else if(e.which) // Netscape/Firefox/Opera
    {
        keynum = e.which;
    }

    if((keynum >= 48) && (keynum <= 57)) {
        return(true);
    }

    var good_codes = [8, 14, 15, 37, 38, 39, 40];
    for(i = 0; i < good_codes.length; i++) {
        if(good_codes[i] == keynum) {
            return(true);
        }
    }

    return(false);
}