function tabOnly(e) {
    var keynum;
    var keychar;
    var numcheck;

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

    if (keynum == '9')
        return true;

    else
        return false;
}

function numberOnly(e) {
    var keynum;
    var keychar;
    var numcheck;

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

    if (keynum == "8" || keynum == "46" || keynum == "9")
        return true;

    keychar = String.fromCharCode(keynum);


    numcheck = /\d/;
    if (numcheck.test(keychar))
        return true;
    else
        return false;
}