function switchImage(img_obj_id, img_file, img_name)
{
    var img_obj = document.getElementById(img_obj_id);
    
    if(img_obj != null)
    {
        img_obj.src = img_file;
        img_obj.alt = img_name;
        img_obj.title = img_name;
    }
}

function updateAdvertiseCityList()
{
    document.getElementById('action').value='update_city_list';
    document.getElementById('advertise_form').submit();
}

function updateSearchCityList()
{
    document.getElementById('action').value='update_city_list';
    document.getElementById('search_form').submit();
}

function checkRules()
{
    obj1 = document.getElementById('action');
    //alert(obj1.value);
    obj2 = document.getElementById('rules');
    if(obj1.value!='confirm_add_advertise' || obj2.checked)
    {
        return true;
    }
    else
    {
        alert("Du måste godkänna våra regler för att kunna lägga in en annons.");
        return false;
    }
}