//sprawdź przeglądarkę

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

if (browserName == "Netscape" && browserVer>= 3) version = "new"; 
else if (browserName == "Microsoft Internet Explorer" && browserVer>= 4) version = "new";
else version = "old";

//jeżeli nowa przeglądarka to włącz podświetlane przyciski
if (version == "new")
 {	
 //przycisk WRÓĆ
 mnu1_of = new Image();
 mnu1_of.src = "../buttons/topmenu/back_of.gif";
 mnu1_on = new Image();
 mnu1_on.src = "../buttons/topmenu/back_on.gif";
 mnu1_nf = new Image();
 mnu1_nf.src = "../buttons/topmenu/back_nf.gif";
 mnu1d_of = new Image();
 mnu1d_of.src = "../buttons/topmenu/back_of.gif";
 mnu1d_on = new Image();
 mnu1d_on.src = "../buttons/topmenu/back_on.gif";
 mnu1d_nf = new Image();
 mnu1d_nf.src = "../buttons/topmenu/back_nf.gif";

 //przycisk WYŻEJ
 mnu2_of = new Image();
 mnu2_of.src = "../buttons/topmenu/up_of.gif";
 mnu2_on = new Image();
 mnu2_on.src = "../buttons/topmenu/up_on.gif";
 mnu2_nf = new Image();
 mnu2_nf.src = "../buttons/topmenu/up_nf.gif";
 mnu2d_of = new Image();
 mnu2d_of.src = "../buttons/topmenu/up_of.gif";
 mnu2d_on = new Image();
 mnu2d_on.src = "../buttons/topmenu/up_on.gif";
 mnu2d_nf = new Image();
 mnu2d_nf.src = "../buttons/topmenu/up_nf.gif";

 //przycisk GŁÓWNA
 mnu3_of = new Image();
 mnu3_of.src = "../buttons/topmenu/home_of.gif";
 mnu3_on = new Image();
 mnu3_on.src = "../buttons/topmenu/home_on.gif";
 mnu3_nf = new Image();
 mnu3_nf.src = "../buttons/topmenu/home_nf.gif";
 mnu3d_of = new Image();
 mnu3d_of.src = "../buttons/topmenu/home_of.gif";
 mnu3d_on = new Image();
 mnu3d_on.src = "../buttons/topmenu/home_on.gif";
 mnu3d_nf = new Image();
 mnu3d_nf.src = "../buttons/topmenu/home_nf.gif";

 //przycisk SPIS TREŚCI
 mnu4_of = new Image();
 mnu4_of.src = "../buttons/topmenu/spis_of.gif";
 mnu4_on = new Image();
 mnu4_on.src = "../buttons/topmenu/spis_on.gif";
 mnu4_nf = new Image();
 mnu4_nf.src = "../buttons/topmenu/spis_nf.gif";
 mnu4d_of = new Image();
 mnu4d_of.src = "../buttons/topmenu/spis_of.gif";
 mnu4d_on = new Image();
 mnu4d_on.src = "../buttons/topmenu/spis_on.gif";
 mnu4d_nf = new Image();
 mnu4d_nf.src = "../buttons/topmenu/spis_nf.gif";

 //przycisk INDEX
 mnu5_of = new Image();
 mnu5_of.src = "../buttons/topmenu/index_of.gif";
 mnu5_on = new Image();
 mnu5_on.src = "../buttons/topmenu/index_on.gif";
 mnu5_nf = new Image();
 mnu5_nf.src = "../buttons/topmenu/index_nf.gif";
 mnu5d_of = new Image();
 mnu5d_of.src = "../buttons/topmenu/index_of.gif";
 mnu5d_on = new Image();
 mnu5d_on.src = "../buttons/topmenu/index_on.gif";
 mnu5d_nf = new Image();
 mnu5d_nf.src = "../buttons/topmenu/index_nf.gif";

 //przycisk ZNAJDŹ
 mnu6_of = new Image();
 mnu6_of.src = "../buttons/topmenu/find_of.gif";
 mnu6_on = new Image();
 mnu6_on.src = "../buttons/topmenu/find_on.gif";
 mnu6_nf = new Image();
 mnu6_nf.src = "../buttons/topmenu/find_nf.gif";
 mnu6d_of = new Image();
 mnu6d_of.src = "../buttons/topmenu/find_of.gif";
 mnu6d_on = new Image();
 mnu6d_on.src = "../buttons/topmenu/find_on.gif";
 mnu6d_nf = new Image();
 mnu6d_nf.src = "../buttons/topmenu/find_nf.gif";
 }

function btn_up(btnName) 
{
if (version == "new") 
 {
 btnUp = eval(btnName + "_on.src");
 document [btnName].src = btnUp;
 mnuInfo = eval(btnName + "_nf.src");
 document ["mnuinfo"].src = mnuInfo;	
 }
}

function btn_dn(btnName)
{
if (version == "new") 
 {
 btnDn = eval(btnName + "_of.src");
 document [btnName].src = btnDn;
 mnuInfo = "../buttons/topmenu/bokup_in.gif";
 document ["mnuinfo"].src = mnuInfo;	
 }
}