nn = (document.layers) ? true:false;
ie = (document.all) ? true:false;
gecko = (document.getElementById) ? true:false;

browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
version = "no"
if (browserName == "Netscape" && browserVer >= 3) version = "ok"
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok"
if (version == "ok")
{
l0on = new Image();
l0on.src = "grafika/menu/maska5.jpg"
l1on = new Image();
l1on.src = "grafika/menu/maska5.jpg"
l2on = new Image();
l2on.src = "grafika/menu/butony/1.gif"
l3on = new Image();
l3on.src = "grafika/menu/butony/2.gif"
l4on = new Image();
l4on.src = "grafika/menu/butony/3.gif"
l5on = new Image();
l5on.src = "grafika/menu/butony/5.gif"
l6on = new Image();
l6on.src = "grafika/menu/butony/4.gif";button1on = new Image();
button1on.src = "grafika/menu/butony/a1_wl.gif";
button1off = new Image();
button1off.src = "grafika/menu/butony/a1.gif";button2on = new Image();
button2on.src = "grafika/menu/butony/b5_wl.gif";
button2off = new Image();
button2off.src = "grafika/menu/butony/b5.gif";
button3on = new Image();
button3on.src = "grafika/menu/butony/c5_wl.gif";
button3off = new Image();
button3off.src = "grafika/menu/butony/c5.gif";
button4on = new Image();
button4on.src = "grafika/menu/butony/d5_wl.gif";
button4off = new Image();
button4off.src = "grafika/menu/butony/d5.gif";
button5on = new Image();
button5on.src = "grafika/menu/butony/e5_wl.gif";
button5off = new Image();
button5off.src = "grafika/menu/butony/e5.gif";
button6on = new Image();
button6on.src = "grafika/menu/butony/f5_wl.gif";
button6off = new Image();
button6off.src = "grafika/menu/butony/f5.gif";
}
function set(imgName) 
{
if (version == "ok")
{
imgOn = eval(imgName + "on.src");
document["trans"].src = imgOn;
}
}
function img_act(imgName){
 if (version == "ok"){
 imgOn = eval(imgName + "on.src");
 document [imgName].src = imgOn;
}
}
function img_inact(imgName){
 if (version == "ok"){
 imgOff = eval(imgName + "off.src");
 document [imgName].src = imgOff;
}
}