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="ok"; 

if (version == "ok") { 

m1 = new Image();
m1.src = "images/menu_gabinet.gif";
m1_on = new Image();
m1_on.src = "images/menu_gabinet_on.gif";

m2 = new Image();
m2.src = "images/menu_my_w_pracy.gif";
m2_on = new Image();
m2_on.src = "images/menu_my_w_pracy_on.gif";

m3 = new Image();
m3.src = "images/menu_cennik.gif";
m3_on = new Image();
m3_on.src = "images/menu_cennik_on.gif";

m4 = new Image();
m4.src = "images/menu_media.gif";
m4_on = new Image();
m4_on.src = "images/menu_media_on.gif";

m5 = new Image();
m5.src = "images/menu_kontakt.gif";
m5_on = new Image();
m5_on.src = "images/menu_kontakt_on.gif";

m6 = new Image();
m6.src = "images/menu_polecane.gif";
m6_on = new Image();
m6_on.src = "images/menu_polecane_on.gif";



m7 = new Image();
m7.src = "images/mb_stomatologia.gif";
m7_on = new Image();
m7_on.src = "images/mb_stomatologia_on.gif";

m8 = new Image();
m8.src = "images/mbok_ortodoncja.gif";
m8_on = new Image();
m8_on.src = "images/mbok_ortodoncja_on.gif";

m9 = new Image();
m9.src = "images/mbok_chirurgia.gif";
m9_on = new Image();
m9_on.src = "images/mbok_chirurgia_on.gif";

m10 = new Image();
m10.src = "images/mbok_protetyka.gif";
m10_on = new Image();
m10_on.src = "images/mbok_protetyka_on.gif";

m11 = new Image();
m11.src = "images/mbok_profilaktyka.gif";
m11_on = new Image();
m11_on.src = "images/mbok_profilaktyka_on.gif";

m12 = new Image();
m12.src = "images/mbok_rentgen.gif";
m12_on = new Image();
m12_on.src = "images/mbok_rentgen_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];
  }
}


//Otwieranie okienka popup

   var win = null;

function okienko(mypage,myname,w,h,scroll){

LeftPosition = 10;

TopPosition = 10;

settings =

'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'

win = window.open(mypage,myname,settings)

}