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

if (browserName == "Netscape" && browserVer >= 3) version="ok";
else if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version="ok";
else version="no";

if (version == "ok") {

m1 = new Image();
m1.src = "i/bt_ofirmie_off.gif";
m1_on = new Image();
m1_on.src = "i/bt_ofirmie_on.gif";

m_2 = new Image();
m_2.src = "i/bt_galeria_off.gif";
m_2_on = new Image();
m_2_on.src = "i/bt_galeria_on.gif";

m_3 = new Image();
m_3.src = "i/bt_klienci_off.gif";
m_3_on = new Image();
m_3_on.src = "i/bt_klienci_on.gif";

m4 = new Image();
m4.src = "i/bt_kontakt_off.gif";
m4_on = new Image();
m4_on.src = "i/bt_kontakt_on.gif";



m5 = new Image();
m5.src = "i/bt_1_off.gif";
m5_on = new Image();
m5_on.src = "i/bt_1_on.gif";

m6 = new Image();
m6.src = "i/bt_2_off.gif";
m6_on = new Image();
m6_on.src = "i/bt_2_on.gif";

m7 = new Image();
m7.src = "i/bt_3_off.gif";
m7_on = new Image();
m7_on.src = "i/bt_3_on.gif";


m8 = new Image();
m8.src = "i/bt_4_off.gif";
m8_on = new Image();
m8_on.src = "i/bt_4_on.gif";


}

function img_over(obrazek) {
if (version == "ok") {
document[obrazek].src = eval(obrazek + "_on.src");
}
}

function img_out(obrazek) {
if (version == "ok") {
document[obrazek].src = eval(obrazek + ".src");
}
}

//Preload buttonów podmiany
function preload() {
  if (!document.images) return;
  var ar = new Array();
  var arguments = preload.arguments;
  for (var i = 0; i < arguments.length; i++) {
    ar[i] = new Image();
    ar[i].src = arguments[i];
  }
}