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// Populate the brand list
function populateNavBrand(brandList, modelList)
{
    removeAll(brandList);

    if(brandList != null)
    {
        for(var i=0; i<data.length; i++)
        {
            brandList.options[brandList.options.length] = new Option(data[i][0], data[i][1]);
        }
    }

    brandList.selectedIndex = 0;

    populateNavModel(brandList, modelList);
}

// Populate the car model list
function populateNavModel(brandList, modelList)
{
    removeAll(modelList);
    
    if(modelList != null)
    {
        var brand = data[brandList.selectedIndex];
        for(var i=2; i<brand.length; i++)
        {
            modelList.options[modelList.options.length] = new Option(brand[i][0], brand[i][0]);
        }
    }

    modelList.selectedIndex = 0;
}

// Remove all items from a drop down list
function removeAll(list)
{
    if(list != null && list.options.length > 0)
    {
        var length = list.options.length;
        for(var i=0; i<length; i++)
        {
            list.options[0] = null;
        }
    }
}