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

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

    if((keynum > 47) && (keynum < 58))
        return true;

    if((keynum > 95) && (keynum < 106))
        return true;

    if((keynum == 109) || (keynum == 189))
        return true;

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

    return false;
}