function octalchange ()
{
    var val = document.chmod.t_total.value;
    var ownerbin = parseInt(val.charAt(0)).toString(2);
    while (ownerbin.length<3) { ownerbin="0"+ownerbin; };
    var groupbin = parseInt(val.charAt(1)).toString(2);
    while (groupbin.length<3) { groupbin="0"+groupbin; };
    var otherbin = parseInt(val.charAt(2)).toString(2);
    while (otherbin.length<3) { otherbin="0"+otherbin; };
    document.chmod.owner4.checked = parseInt(ownerbin.charAt(0));
    document.chmod.owner2.checked = parseInt(ownerbin.charAt(1));
    document.chmod.owner1.checked = parseInt(ownerbin.charAt(2));
    document.chmod.group4.checked = parseInt(groupbin.charAt(0));
    document.chmod.group2.checked = parseInt(groupbin.charAt(1));
    document.chmod.group1.checked = parseInt(groupbin.charAt(2));
    document.chmod.other4.checked = parseInt(otherbin.charAt(0));
    document.chmod.other2.checked = parseInt(otherbin.charAt(1));
    document.chmod.other1.checked = parseInt(otherbin.charAt(2));
    calc_chmod(1);
};

function calc_chmod(nototals)
{
    var users = new Array("owner", "group", "other");
    var totals = new Array("","","");
    var syms = new Array("","","");

    for (var i=0; i<users.length; i++)
    {
        var user=users[i];
        var field4 = user + "4";
        var field2 = user + "2";
        var field1 = user + "1";
        //var total = "t_" + user;
        var symbolic = "sym_" + user;
        var number = 0;
        var sym_string = "";

        if (document.chmod[field4].checked == true) { number += 4; }
        if (document.chmod[field2].checked == true) { number += 2; }
        if (document.chmod[field1].checked == true) { number += 1; }

        if (document.chmod[field4].checked == true) {
            sym_string += "r";
        } else {
            sym_string += "-";
        }
        if (document.chmod[field2].checked == true) {
            sym_string += "w";
        } else {
            sym_string += "-";
        }
        if (document.chmod[field1].checked == true) {
            sym_string += "x";
        } else {
            sym_string += "-";
        }
        totals[i] = totals[i]+number;
        syms[i] =  syms[i]+sym_string;

    };
    if (!nototals) document.chmod.t_total.value = totals[0] + totals[1] + totals[2];
    document.chmod.sym_total.value = "-" + syms[0] + syms[1] + syms[2];
}
window.onload=octalchange