if (document.images) {
   tn_gaeste_on                 = new Image();
   tn_gaeste_on.src             = "images/topnav/gaeste_white.gif";
   tn_anfrage_on                = new Image();
   tn_anfrage_on.src            = "images/topnav/anfrage_white.gif";
   tn_contactHome_on            = new Image();
   tn_contactHome_on.src        = "images/topnav/contactHome_white.gif";

   tn_gaeste_off                = new Image();
   tn_gaeste_off.src            = "images/topnav/gaeste.gif";
   tn_anfrage_off               = new Image();
   tn_anfrage_off.src           = "images/topnav/anfrage.gif";
   tn_contactHome_off           = new Image();
   tn_contactHome_off.src       = "images/topnav/contactHome.gif";

   tn_unser_betrieb_on          = new Image();
   tn_unser_betrieb_on.src      = "images/topnav/unser_betrieb_white.gif";
   tn_standort_on               = new Image();
   tn_standort_on.src           = "images/topnav/standort_white.gif";
   tn_unsere_leistungen_on      = new Image();
   tn_unsere_leistungen_on.src  = "images/topnav/unsere_leistungen_white.gif";
   tn_referenz_on               = new Image();
   tn_referenz_on.src           = "images/topnav/referenz_white.gif";

   tn_unser_betrieb_off         = new Image();
   tn_unser_betrieb_off.src     = "images/topnav/unser_betrieb.gif";
   tn_standort_off              = new Image();
   tn_standort_off.src          = "images/topnav/standort.gif";
   tn_unsere_leistungen_off     = new Image();
   tn_unsere_leistungen_off.src = "images/topnav/unsere_leistungen.gif";
   tn_referenz_off              = new Image();
   tn_referenz_off.src          = "images/topnav/referenz.gif";

   ln_tapeten_on                = new Image();
   ln_tapeten_on.src            = "images/leftnav/tapeten_down.gif";
   ln_belaege_on                = new Image();
   ln_belaege_on.src            = "images/leftnav/belaege_down.gif";
   ln_fassaden_on               = new Image();
   ln_fassaden_on.src           = "images/leftnav/fassaden_down.gif";
   ln_techniken_on              = new Image();
   ln_techniken_on.src          = "images/leftnav/techniken_down.gif";
   ln_putze_on                  = new Image();
   ln_putze_on.src              = "images/leftnav/putze_down.gif";

   ln_tapeten_off               = new Image();
   ln_tapeten_off.src           = "images/leftnav/tapeten.gif";
   ln_belaege_off               = new Image();
   ln_belaege_off.src           = "images/leftnav/belaege.gif";
   ln_fassaden_off              = new Image();
   ln_fassaden_off.src          = "images/leftnav/fassaden.gif";
   ln_techniken_off             = new Image();
   ln_techniken_off.src         = "images/leftnav/techniken.gif";
   ln_putze_off                 = new Image();
   ln_putze_off.src             = "images/leftnav/putze.gif";

   ln_guetezei_on                = new Image();
   ln_guetezei_on.src            = "images/leftnav/guetezei_down.gif";
   ln_symbole_on                 = new Image();
   ln_symbole_on.src             = "images/leftnav/symbole_down.gif";
   ln_struktap_on                = new Image();
   ln_struktap_on.src            = "images/leftnav/struktap_down.gif";

   ln_guetezei_off               = new Image();
   ln_guetezei_off.src           = "images/leftnav/guetezei.gif";
   ln_symbole_off                = new Image();
   ln_symbole_off.src            = "images/leftnav/symbole.gif";
   ln_struktap_off               = new Image();
   ln_struktap_off.src           = "images/leftnav/struktap.gif";

   ln_teppichboeden_on           = new Image();
   ln_teppichboeden_on.src       = "images/leftnav/teppichboeden_down.gif";
   ln_kunststoffbelaege_on       = new Image();
   ln_kunststoffbelaege_on.src   = "images/leftnav/kunststoffbelaege_down.gif";
   ln_kork_naturboeden_on        = new Image();
   ln_kork_naturboeden_on.src    = "images/leftnav/kork_naturboeden_down.gif";

   ln_teppichboeden_off          = new Image();
   ln_teppichboeden_off.src      = "images/leftnav/teppichboeden.gif";
   ln_kunststoffbelaege_off      = new Image();
   ln_kunststoffbelaege_off.src  = "images/leftnav/kunststoffbelaege.gif";
   ln_kork_naturboeden_off       = new Image();
   ln_kork_naturboeden_off.src   = "images/leftnav/kork_naturboeden.gif";








  }

function tnImgOn(imgName) {
  var obj, img ,objStr;

  objStr = 'window.document.'+imgName;
  obj = eval(objStr);
  if (obj != null) {
    objStr = imgName+'_on';
    img = eval(objStr);
    if (img != null)
      obj.src = img.src;
  }
}

function tnImgOff(imgName) {
  var obj, img ,objStr;

  objStr = 'window.document.'+imgName;
  obj = eval(objStr);
  if (obj != null) {
    objStr = imgName+'_off';
    img = eval(objStr);
    if (img != null)
      obj.src = img.src;
  }
}

function tnCopyOn(imgName) {

}

function tnCopyOff(imgName) {

}