function doAdvancedSearch(address_prefix)
{
    if(document.getElementById("adv_wanted_flag1").checked == true)
    {
        wanted_flag = true;
        wanted_name = "wanted";
    }
    else
    {
        wanted_flag = false;
        wanted_name = "forsale";
    }
    key_words = document.getElementById('adv_keywords').value;
    
    if(key_words == "")
    {
        key_words = "all";
    }
    
    pref_select_obj = document.getElementById('adv_pref');
    search_index = pref_select_obj.selectedIndex;
    search_pref = pref_select_obj.options[search_index].value;
    
    town = document.getElementById('adv_town').value;
    area = document.getElementById('adv_area').value;
    
    country_select_obj = document.getElementById('adv_country');
    country_index = country_select_obj.selectedIndex;
    country = country_select_obj.options[country_index].value;
    if(country != "")
    {
        country_text = country_select_obj.options[country_index].text;
    }
    else
    {
        country_text="";
    }
    
    
    if(town != "") key_words += "%20"+town;
    if(area != "") key_words += "%20"+area;
    if(country_text != "") key_words += "%20"+country_text;
    
    adv_action = address_prefix+"/"+wanted_name+"/"+key_words+"/1/"+search_pref;
    
    document.getElementById('advsearch').action = adv_action;
}