chmod generator

    var ro  = 0;
    var rg  = 0;
    var rot = 0;
    var wo  = 0;
    var wg  = 0;
    var wot = 0;
    var eo  = 0;
    var eg  = 0;
    var eot = 0;

    function update(compid){
        switch(compid){
            case "r_owner":
                if(ro == 1){
                    ro = 0;
                }else{
                    ro = 1;
                }
            break;
            case "r_group":
                if(rg == 1){
                    rg = 0;
                }else{
                    rg = 1;
                }
            break;
            case "r_other":
                if(rot == 1){
                    rot = 0;
                }else{
                    rot = 1;
                }
            break;

            case "w_owner":
                if(wo == 1){
                    wo = 0;
                }else{
                    wo = 1;
                }
            break;
            case "w_group":
                if(wg == 1){
                    wg = 0;
                }else{
                    wg = 1;
                }
            break;
            case "w_other":
                if(wot == 1){
                    wot = 0;
                }else{
                    wot = 1;
                }
            break;

            case "e_owner":
                if(eo == 1){
                    eo = 0;
                }else{
                    eo = 1;
                }
            break;
            case "e_group":
                if(eg == 1){
                    eg = 0;
                }else{
                    eg = 1;
                }
            break;
            case "e_other":
                if(eot == 1){
                    eot = 0;
                }else{
                    eot = 1;
                }
            break;
        }
        calculateChmod();
    }

    function calculateChmod(){

        var owner = 0;
        var group = 0;
        var other = 0;

        if(ro == 1){
            owner = owner + 4;
        }
        if(wo == 1){
            owner = owner + 2;
        }
        if(eo == 1){
            owner = owner + 1;
        }
        if(rg == 1){
            group = group + 4;
        }
        if(wg == 1){
            group = group + 2;
        }
        if(eg == 1){
            group = group + 1;
        }
        if(rot == 1){
            other = other + 4;
        }
        if(wot == 1){
            other = other + 2;
        }
        if(eot == 1){
            other = other + 1;
        }

        var chmod = owner + "" + group + "" + other;
        document.getElementById("code").value = chmod;
        document.getElementById("codetorun").innerHTML = "chmod "+chmod+" /pad/naar/het/bestand"
    }