browserNev = navigator.appName;
browserVer = parseInt(navigator.appVersion);

if (browserNev == "Netscape" && browserVer >= 3) 
  browserVer = "1";
else if (browserNev == "Microsoft Internet Explorer" && browserVer >= 4)
  browserVer = "1";
else browserVer = "2";

if (browserVer == 1){
  m1 = new Image(); m1.src = "mmenu1.gif";
  m2 = new Image(); m2.src = "zmenu1.gif";
  m3 = new Image(); m3.src = "mmenu2.gif";
  m4 = new Image(); m4.src = "zmenu2.gif";
  m5 = new Image(); m5.src = "mmenu3.gif";
  m6 = new Image(); m6.src = "zmenu3.gif";
  m7 = new Image(); m7.src = "mmenu4.gif";
  m8 = new Image(); m8.src = "zmenu4.gif";
  m9 = new Image(); m9.src = "mmenu5.gif";
  m10 = new Image(); m10.src = "zmenu5.gif";
  m11 = new Image(); m11.src = "mmenu6.gif";
  m12 = new Image(); m12.src = "zmenu6.gif";
  m13 = new Image(); m13.src = "mmenu7.gif";
  m14 = new Image(); m14.src = "zmenu7.gif";
  m15 = new Image(); m15.src = "mmenu8.gif";
  m16 = new Image(); m16.src = "zmenu8.gif";
  m17 = new Image(); m17.src = "mmenu9.gif";
  m18 = new Image(); m18.src = "zmenu9.gif";
  m19 = new Image(); m19.src = "mmenu10.gif";
  m20 = new Image(); m20.src = "zmenu10.gif";
  m21 = new Image(); m21.src = "haza.gif";
  m22 = new Image(); m22.src = "zhaza.gif";
  l1 = new Image(); l1.src = "etks.gif";
  l2 = new Image(); l2.src = "etkz.gif";
}

function mutat(kep_nev,kep_obj){
  if (browserVer == 1)
    document.images[kep_nev].src = kep_obj.src;
}