var formClicked = false;
     
  function zoekType(type){      
    document.forms['zoeken'].type.value = type;
  }
  function refreshObjects(refList, url, type){
    var qs = new Querystring()
    var value = refList.options[refList.selectedIndex].value;
  
    if (refList.selectedIndex > 0){
      if (type == 'soortobject'){
        url += '?filtersoort=' + value;
        if (qs.get("filterprovincie")) {
          if (qs.get("filterprovincie").length > 0)
            url += '&filterprovincie=' + qs.get("filterprovincie");
        }
      }
      if (type == 'provincie'){
        url += '?filterprovincie=' + value;      
        if (qs.get("filtersoort")) {
          if (qs.get("filtersoort").length > 0)
            url += '&filtersoort=' + qs.get("filtersoort");
        }
      }       
      document.location.replace(url);
    } else { // alle soorten / provincies tonen
      if (type == 'provincie') {
        if (qs.get("filtersoort"))
          url += '?filtersoort=' + qs.get("filtersoort");
      }
      if (type == 'soortobject'){
        if (qs.get("filterprovincie"))
          url += '?filterprovincie=' + qs.get("filterprovincie");
      }
      document.location.replace(url);
    }
  }
  
  function formCheck(ref){  
    var valid = true;
    var msg = "De volgende verplichte velden zijn leeggelaten:\n";
    
    if (formClicked) return false;
    
    if (ref.naam){
      if (ref.naam.value == ''){
        msg += " - Naam\n";
        valid = false;
      }
    }    
    if (ref.straat_huisnummer){
      if (ref.straat_huisnummer.value == ''){
        msg += " - Straat & huisnummer\n";
        valid = false;        
      }
    }    
    if (ref.postcode){
      if (ref.postcode.value == ''){
        msg += " - Postcode\n";
        valid = false;        
      }
    }         
    if (ref.plaats){
      if (ref.plaats.value == ''){
        msg += " - Plaats\n";
        valid = false;        
      }
    }
    if (ref.telefoonnr){
      if (ref.telefoonnr.value == ''){
        msg += " - Telefoonnummer\n";
        valid = false;        
      }
    }
    if (ref.email){
      if (ref.email.value == ''){
        msg += " - Email\n";
        valid = false;        
      }
    }              
             
    if (valid){      
      formClicked = true;    
    }
    else{
      alert(msg);
      return false;
    }    
    return true;
  }  
  
  function setType(type){  
    if (document.getElementById('sel-dummy')){ 
      if (type == ''){        
        document.getElementById('sel-dummy').style.display = 'block';
        document.getElementById('sel-koop').style.display = 'none';
        document.getElementById('sel-huur').style.display = 'none';         
      }
      else{
        if (type == 'koop'){
          document.getElementById('sel-dummy').style.display = 'none';        
          document.getElementById('sel-koop').style.display = 'block';
          document.getElementById('sel-huur').style.display = 'none';          
        }
        if (type == 'huur'){
          document.getElementById('sel-dummy').style.display = 'none';        
          document.getElementById('sel-koop').style.display = 'none';
          document.getElementById('sel-huur').style.display = 'block';          
        }
      }
    }
  }
  
  /* Client-side access to querystring name=value pairs
	Version 1.2.3
	22 Jun 2005
	Adam Vandenberg
  */
  function Querystring(qs) { // optionally pass a querystring to parse
  	this.params = new Object()
  	this.get=Querystring_get
  	
  	if (qs == null)
  		qs=location.search.substring(1,location.search.length)

  	if (qs.length == 0) return

  // Turn <plus> back to <space>
  // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
  	qs = qs.replace(/\+/g, ' ')
  	var args = qs.split('&') // parse out name/value pairs separated via &
  	
  // split out each name=value pair
  	for (var i=0;i<args.length;i++) {
  		var value;
  		var pair = args[i].split('=')
  		var name = unescape(pair[0])

  		if (pair.length == 2)
  			value = unescape(pair[1])
  		else
  			value = name
  		
  		this.params[name] = value
  	}
  }

  function Querystring_get(key, default_) {
  	// This silly looking line changes UNDEFINED to NULL
  	if (default_ == null) default_ = null;
  	
  	var value=this.params[key]
  	if (value==null) value=default_;
  	
  	return value
  }