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/home1.gif"
  a2 = new Image();		a2.src ="img/home2.gif"
  b1 = new Image();		b1.src ="img/mapka1.gif"
  b2 = new Image();		b2.src ="img/mapka2.gif"
  c1 = new Image();		c1.src ="img/kontakt1.gif"
  c2 = new Image();		c2.src ="img/kontakt2.gif"
  d1 = new Image();		d1.src ="img/onas1.gif"
  d2 = new Image();		d2.src ="img/onas2.gif"
  e1 = new Image();     e1.src ="img/aktual1.gif"
  e2 = new Image();     e2.src ="img/aktual2.gif"
  f1 = new Image();     f1.src ="img/uslugi1.gif"
  f2 = new Image();     f2.src ="img/uslugi2.gif"
  g1 = new Image();     g1.src ="img/metodol1.gif"
  g2 = new Image();     g2.src ="img/metodol2.gif"
  h1 = new Image();     h1.src ="img/doswiad1.gif"
  h2 = new Image();     h2.src ="img/doswiad2.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;
        }
}