function Navi() {
  
  this.baseId = 0;
  this._lastId = 0;
  
  this._imagesPath = "./fileadmin/templates/img/navi/";
  this._images = new Array("wohnungsangebote_hover.gif", "wohnungsangebote_dark_hover.gif", "unternehmen_hover.gif", "unternehmen_dark_hover.gif", "mitgliedschaft_hover.gif", "mitgliedschaft_dark_hover.gif", "mieterservice_hover.gif", "mieterservice_dark_hover.gif", "news_hover.gif", "news_dark_hover.gif");
  
  this.hide = function() {
  
    document.getElementById("sub_navi_" + (this._lastId + 1)).style.display = "none";
    
    return true;
    
  }
  
  this.show = function(id) {
    
    this._lastId = id;
    
    var display = "none";
    
    for (var i = 0; i < 5; i++) {
      
      if (i == id)
        display = "block";
      else
        display = "none";
      
      document.getElementById("sub_navi_" + (i + 1)).style.display = display;
      
    }
    
    return true;
    
  }
  
  this.showLastId = function() {
    
    return this.show(this._lastId);
    
  }
  
  this.preload = function() {
    
    var images = new Array();
    
    for (var i = 0; i < this._images.length; i++) {
      
      images[i] = new Image();
      images[i].src = this._imagesPath + this._images[i];
      
    }
    
    return true;
    
  }
  
}


// ////////////////////////////////////////////////////////////

String.prototype.trim = function() {
  
  return this.replace(/^\s+|\s+$/g, "");
  
}

function getOfferId() {
  
  var offerId = "";
  
  with (document.getElementById("content_left")) {
    
    offerId = getElementsByTagName("p")[0].firstChild.innerHTML.trim() + ", ";
    offerId += getElementsByTagName("p")[3].innerHTML.trim() + ", ";
    offerId += getElementsByTagName("p")[4].innerHTML.trim();
    
  }
  
  return encodeURI(offerId);
  
}