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 = "screen/screen_09.jpg";
m1_on = new Image();
m1_on.src = "screen/screen_on_09.jpg";

m2 = new Image();
m2.src = "screen/screen_10.jpg";
m2_on = new Image();
m2_on.src = "screen/screen_on_10.jpg";

m3 = new Image();
m3.src = "screen/screen_11.jpg";
m3_on = new Image();
m3_on.src = "screen/screen_on_11.jpg";

m4 = new Image();
m4.src = "screen/screen_12.jpg";
m4_on = new Image();
m4_on.src = "screen/screen_on_12.jpg";


} 

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];
  }
}

//Otwieranie okienka popup



var win = null;
function NewWindow(mypage,myname,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
win = window.open(mypage,myname,settings)
}