school_form = {
  
  fields: ['detail_education_country',
           'detail_education_city_suggest',
           'detail_education_city_dropdown',
//           'detail_education_subcity',
           'detail_education_univercity',
           'detail_education_school',
           'detail_education_gschool',
           'detail_education_start_year',
           'detail_education_finish_year',
           'detail_education_field',
           'detail_education_subject',
           'detail_education_school_email'],
  fields_map: [[0,0,0,0,0,0,0,0,0,0,0],
               [1,0,0,1,0,0,1,0,1,0,1],
               [1,0,0,1,0,0,1,1,1,0,1],
               [1,0,0,0,1,0,0,0,0,0,0],
               [1,0,0,0,0,1,0,0,0,0,0],],
  
  fields_map_set: null,
  
  education_type: null,
  
  set_fields: function(type) {
    this.fields_map_set = type;
    for (var i = 0; i < this.fields.length; ++i) {
      if (this.fields_map[type][i]) {
        this.show(i);
      } else {
        this.hide(i);
      }
    }
  },
  set_fields_country: function(country) {
    var type = this.fields_map_set;
    if (country == 'TR') {
      this.hide(1);
      this.show(2);
      if (this.fields_map[type][8]) {
      	this.show(8, 'TR');
      } else {
      	this.hide(8);
      }
   	  this.hide(9);
    } else {
      this.hide(2);
      this.show(1);
      if (this.fields_map[type][8]) {
        if (country == 'DE') {
          this.show(8, 'DE');
        } else {
          this.show(8, main_language.substr(3, 2));
        }
        if (country != 'DE' && main_language == 'tr_TR') {
          this.hide(9);
        } else {
          this.show(9);
        }
      } else {
      	this.hide(8);
        this.hide(9);
      }
    }
  },
  set_country: function(country) {
    this.set_fields_country(country);
    if (country == 'TR') {
      this.get_city(this.fields[2], country);
    }
    this.get_school('', '');
    if (country != 'TR' && country != 'DE') {
      country = main_language.substr(-2, 2);
    }
    this.get_subject('');
  },
  show: function(id) {
    var country = ''
	if (arguments.length > 1) {
	  var country = '_' + arguments[1];
	}
    if (document.getElementById){
      obj = document.getElementById(this.fields[id] + '_tr');
      obj.style.display="";
      selobjs = obj.getElementsByTagName("select");
      for (var i = 0; i < selobjs.length; i++) {
      	if (selobjs[i].getAttribute('name') == this.fields[id] + country) {
      	  selobjs[i].style.display="";
      	} else {
          selobjs[i].style.display="none";
      	}
      }
    } 
  },
  hide: function(id) {
    if (document.getElementById){
      obj = document.getElementById(this.fields[id] + '_tr');
      if (obj != null) {
        obj.style.display="none";
        selobjs = obj.getElementsByTagName("select");
        if (selobjs.length > 0) {
          selobjs[0].style.display="none";
        }
      }
    }
  },
  set_visible: function(status) {
    var country = document.getElementById(this.fields[0]).value;
    this.education_type = status;
    switch (status) {
      case 'sou':
        this.set_fields(1);
        this.set_fields_country(country);
        break;
      case 'aou':
        this.set_fields(2);
        this.set_fields_country(country);
        break;
      case 'eou':
        this.set_fields(1);
        this.set_fields_country(country);
        break;
      case 'soh':
        this.set_fields(3);
        this.set_fields_country(country);
        break;
      case 'sog':
        this.set_fields(4);
        this.set_fields_country(country);
        break;
      default:
        this.set_fields(0);
        break;
    }
  },
  get_data: function(data) {
    if (data != null) {
      var xmlhttp = null;
      try {
        xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
      } catch (e) {
        try {
          xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
        } catch (e) {
          xmlhttp = null;
        }
      }
      if (xmlhttp == null && typeof(XMLHttpRequest) != 'undefined') {
        xmlhttp = new XMLHttpRequest();
      }
      if (xmlhttp != null) {
        xmlhttp.open('GET', data.url, true);
        xmlhttp.onreadystatechange = function() { this.get_data_callback(xmlhttp, data); }.bind(this);
        xmlhttp.send(null);
      }
    }
  },
  get_data_callback: function(xmlhttp, data_object) {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
      var xmldoc = xmlhttp.responseXML;
      try {
        var rapidsuggest = xmldoc.getElementsByTagName('rapidsuggest').item(0);
        if (rapidsuggest.getElementsByTagName('suggestion').length == 0) {
          school_form.dropdown_clear(data_object.dropdown_list);
          school_form.dropdown_add_option(data_object.dropdown_list, data_object.no_data_text, 'null', true);
          data_object.dropdown_list.parentNode.replaceChild(data_object.dropdown_list, data_object.dropdown_list); // for IE6
          return;
        }
        var list = '<list>';
        for (var j = 0; j < rapidsuggest.getElementsByTagName('suggestion').length; ++j) {
          list += rapidsuggest.getElementsByTagName('suggestion').item(j).firstChild.data;
        }
        list += '</list>';
        school_form.dropdown_add_hoptions(data_object.dropdown_list, list);
      } catch (e) {

      }
    }
  },
  dropdown_add_option: function(dropdown_list, text, value, is_default, is_selected) {
    var dropdown_option = document.createElement("option");
    dropdown_option.appendChild(document.createTextNode(text));
    dropdown_option.setAttribute("value", value);
    dropdown_option.setAttribute("label", text);
    if (is_default) dropdown_option.defaultSelected = true;
    else if (is_selected) dropdown_option.selected = true;
    dropdown_list.appendChild(dropdown_option);
  },
  dropdown_add_hoptions: function(dropdown_list, html) {
    try //Internet Explorer
    {
      var xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
      xmlDoc.async="false";
      xmlDoc.loadXML(html);
    }
    catch(e)
    {
      try //Firefox, Mozilla, Opera, etc.
      {
        parser=new DOMParser();
        var xmlDoc=parser.parseFromString(html,"text/xml");
      }
      catch(e) {alert(e.message)}
    }

    try
    {
      var xml_options = xmlDoc.getElementsByTagName('option');

      var new_dropdown_list = dropdown_list.cloneNode(true);
      this.dropdown_clear(new_dropdown_list);
      this.dropdown_add_option(new_dropdown_list, field_string_table.sp01, 'null', true);
      for (var j = 0; j < xml_options.length; ++j) {
        var text = xml_options[j].childNodes[0].nodeValue;
        var value = xml_options[j].getAttribute('value');
        this.dropdown_add_option(new_dropdown_list, text, value);
      }
//      alert(new_dropdown_list.getAttribute('id'));
      new_dropdown_list.disabled = false;
//      dropdown_list.setAttribute("id", new_dropdown_list.getAttribute('id') + "_old");
      dropdown_list.parentNode.replaceChild(new_dropdown_list, dropdown_list);
    }
    catch(e) {alert(e.message)}
  },
  dropdown_clear: function(dropdown_list) {
    for (var i=dropdown_list.options.length; i > 0; i--)
    {
      dropdown_list.remove(i-1);
    }
  },
  dropdown_loading_status: function(dropdown_list) {
    this.dropdown_clear(dropdown_list);
    this.dropdown_add_option(dropdown_list, field_string_table.sp02, 'null', true);
    dropdown_list.disabled = true;
  },
  get_city: function(dropdown_id, country, school_type, additional_city_id) {
    var dropdown_list = document.getElementById(dropdown_id);
    this.dropdown_loading_status(dropdown_list);
    dropdown_list.parentNode.replaceChild(dropdown_list, dropdown_list); // for IE6
    this.get_data({url: "/ajax-city.html?query_set=" + country +
          (this.education_type ? "&school_type=" + this.education_type : "") +
          (additional_city_id ? "&acid=" + additional_city_id : ""),
          dropdown_list: dropdown_list, no_data_text: ''});
  },
  get_school: function(city, city_type) {
    switch (this.education_type) {
      case 'sou':
      case 'aou':
      case 'eou':
        dropdown_id = this.fields[3];
        var type = 1;
        break;
      case 'soh':
        dropdown_id = this.fields[4];
        var type = 0;
        break;
      case 'sog':
        dropdown_id = this.fields[5];
        var type = 2;
        break;
      default:
        this.set_fields(0);
        break;
    }

    var dropdown_list = document.getElementById(dropdown_id);
    this.dropdown_loading_status(dropdown_list);
    dropdown_list.parentNode.replaceChild(dropdown_list, dropdown_list); // for IE6
    if (city == null) {
      this.dropdown_clear(dropdown_list);
      this.dropdown_add_option(dropdown_list, field_string_table.sp08, 'null', true)
      return;
    }
    this.get_data({url: "/school-get.html?city=" + encodeURIComponent(city) + "&city_type=" + city_type + "&type=" + type,
          dropdown_list: dropdown_list, no_data_text: field_string_table.sp08});
  },
  get_subject: function(field) {
    var dropdown_list = document.getElementById(this.fields[9]);
    this.dropdown_loading_status(dropdown_list);
    dropdown_list.parentNode.replaceChild(dropdown_list, dropdown_list); // for IE6
    this.get_data({url: "/ajax-subject.html?field=" + field,
          dropdown_list: dropdown_list, no_data_text: field_string_table.sp03});
  }
}