versOk = ( ((navigator.appName == "Netscape")&& 
            (parseInt(navigator.appVersion) >= 3)) ||
        
           ((navigator.appName == "Microsoft Internet Explorer")&&
            (parseInt(navigator.appVersion)>=4))
          );
if (versOk) 
{		
  
  a1 = new Image();		a1.src ="img/1ofirmie_de.gif"
  a2 = new Image();		a2.src ="img/2ofirmie_de.gif"
  b1 = new Image();     b1.src ="img/1produkcja_de.gif"
  b2 = new Image();     b2.src ="img/2produkcja_de.gif"
  c1 = new Image();     c1.src ="img/1oferta_de.gif"
  c2 = new Image();     c2.src ="img/2oferta_de.gif"
  d1 = new Image();     d1.src ="img/1ekologia_de.gif"
  d2 = new Image();     d2.src ="img/2ekologia_de.gif"
  e1 = new Image();     e1.src ="img/1certyfikaty_de.gif"
  e2 = new Image();     e2.src ="img/2certyfikaty_de.gif"
f1 = new Image();     f1.src ="img/1system_de.gif"
  f2 = new Image();    f2.src ="img/2system_de.gif"
g1 = new Image();     g1.src ="img/1kontakt_de.gif"
  g2 = new Image();     g2.src ="img/2kontakt_de.gif"

  


}


function rollOn(n)
{
 if (versOk)
        {
           light=eval(n+"2.src");
           document [n].src=light;
        }
}

function rollOff(n)
{
 if (versOk)
        {
           dark=eval(n+"1.src");
           document [n].src=dark;
        }
}