function populateCarriers(carrierid) {
        var aCarrierList = document.getElementById("carrier");
        var usedCarriers = [];
        var aCount = 1;
        for (var anElement = 0; anElement < PhoneObject.length; anElement++) {
            if (!contains(usedCarriers, PhoneObject[anElement].carrier)) {
                usedCarriers[usedCarriers.length] = PhoneObject[anElement].carrier;
                var insertElement = document.createElement("option");
                insertElement.value = PhoneObject[anElement].carrier;
                insertElement.text = PhoneObject[anElement].carrier;

                if (PhoneObject[anElement].carrier == carrierid) {
                    insertElement.selected = "selected";
                }

                aCarrierList[aCount] = insertElement;
                aCount++;
            }
        }

        aPhoneMakersList = document.getElementById("phoneMakersDiv");
        aPhoneMakersList.style.visibility = "hidden";

        aPhoneModelList = document.getElementById("phoneModelsDiv");
        aPhoneModelList.style.visibility = "hidden";
    }


    function populatePhoneMakers(makerid, carrierid) {

        if(!carrierid) {
           var carrierid = document.getElementById("carrier").value;
        }


        var aPhoneMakersList = document.getElementById("phoneMakersDiv");
        var aPhoneModelList = document.getElementById("phoneModelsDiv");
        aPhoneModelList.style.visibility = "hidden";
        aPhoneMakersList.style.visibility = "visible";

        

        if (carrierid == "None") {
            aPhoneMakersList.style.visibility = "hidden";
            aPhoneModelList.style.visibility = "hidden";
            return;
        }

        var usedCarriers = [];
        var optionsHTML = '<select id="phoneMakers" name="phoneMakers" onchange="populatePhones(null);"> <option value="None"> Select a manufacturer</option> ';

        for (var anElement = 0; anElement < PhoneObject.length; anElement++) {
            if (PhoneObject[anElement].carrier == carrierid) {//&& PhoneObject[anElement].v7 == "1") {
                var phone = PhoneObject[anElement].phone;

                if (!contains(usedCarriers, phone)) {
                    usedCarriers[usedCarriers.length] = phone;
                    if (phone == makerid) {
                        optionsHTML += '<option value="'+phone+'" selected>'+phone+'</option> ';
                    } else {
                        optionsHTML += '<option value="'+phone+'">'+phone+'</option> ';
                    }
                }
            }
        }
        aPhoneMakersList.innerHTML = optionsHTML+ " </select>";
    }

    function contains(a, obj) {
        var i = a.length;
        while (i--) {
            if (a[i] === obj) {
                return true;
            }
        }
        return false;
    }

    function populatePhones(phoneid, makerid, carrierid) {
        if (!makerid) {
            var makerid = document.getElementById("phoneMakers").value;
        }

        if(!carrierid) {
            var carrierid = document.getElementById("carrier").value;
        }

        var aPhoneMakerList = document.getElementById("phoneMakers");

        var aPhoneModelList = document.getElementById("phoneModelsDiv");
        aPhoneModelList.style.visibility = "visible";

        if (aPhoneMakerList.value == "None") {
            aPhoneModelList.style.visibility = "hidden";
            return;
        }

        aPhoneModelList.innerHTML = " ";
       var optionsHTML1 = '<select id="phoneModels" name="phoneModels" onchange="Redirect('+fromversion+')"> <option>Select a phone</option> ';

        for (var anElement = 0; anElement < PhoneObject.length; anElement++) {
            if ((PhoneObject[anElement].phone == makerid) && (PhoneObject[anElement].carrier == carrierid)) {//&& PhoneObject[anElement].v7 == "1") {

                if (PhoneObject[anElement].model == phoneid) {
                    optionsHTML1 += '<option value="'+PhoneObject[anElement].id+'" selected>'+PhoneObject[anElement].model+'</option> ';
                } else {
                    optionsHTML1 += '<option value="'+PhoneObject[anElement].id+'">'+PhoneObject[anElement].model+'</option> ';
                }
            }
        }
       aPhoneModelList.innerHTML = optionsHTML1 + " </select>";
    }

    function Redirect(fromversion) {

        var aPhoneModel = document.getElementById("phoneModels").value;

        var aDate = new Date();
        aDate.setTime(aDate.getTime() + 1000*60*60*24);

        if (PhoneObject[aPhoneModel].ver == "7") {
            if (fromversion == 5) {
                result = confirm("The phone you have selected supports My-Cast version 7.\n\nTo view the specific features and learn how to subscribe to My-Cast version 7, click OK.");
                if (!result) {
                    return;
                }
            }
            document.cookie="mphoneID=" + aPhoneModel + "; expires=" + aDate.toGMTString() + "; path=/";
            window.location.href = "/products/mobile-my-cast/";
        } else {
            if (fromversion == 7) {
                result = confirm("The phone you have selected requires the previous version of My-Cast, version 5. Please note that the features are slightly different.\n\nTo view the specific features and learn how to subscribe to My-Cast version 5, click OK.");
                if (!result) {
                    return;
                }
            }
            document.cookie="mphoneID=" + aPhoneModel + "; expires=" + aDate.toGMTString() + "; path=/";
            window.location.href = "/products/mobile-my-cast/v5/";
        }
    }

    function populateAll(carrierid, makerid, phoneid) {
        populateCarriers(carrierid);
        if (makerid && makerid.length > 0) {
            populatePhoneMakers(makerid, carrierid);
        }
        if (phoneid && phoneid.length > 0) {
            populatePhones(phoneid, makerid, carrierid);
        }
    }