function getAppVersion() {
appname= navigator.appName;
appversion = navigator.appVersion;
majorver = appversion.substring(0, 1);
if ( (appname == "Netscape") && ( majorver >= 3 ) ) return 1;
if ( (appname == "Microsoft Internet Explorer") && (majorver >= 4) ) return 1;
return 0;
}
function swtch(num, imgname) {
if (getAppVersion()) {
document[imgname].src = img[num].src;
}
}
imgsrc = new Array();

imgsrc[1] = "images/Tlac_Novinky_1.gif";
imgsrc[2] = "images/Tlac_Novinky_2.gif";
imgsrc[3] = "images/Tlac_Nasproj_1.gif";
imgsrc[4] = "images/Tlac_Nasproj_2.gif";
imgsrc[5] = "images/Tlac_Osobnosti_1.gif";
imgsrc[6] = "images/Tlac_Osobnosti_2.gif";
imgsrc[7] = "images/Tlac_Registrace_1.gif";
imgsrc[8] = "images/Tlac_Registrace_2.gif";
imgsrc[9] = "images/Tlac_Castotaz_1.gif";
imgsrc[10] = "images/Tlac_Castotaz_2.gif";
imgsrc[11] = "images/Tlac_Desatero_1.gif";
imgsrc[12] = "images/Tlac_Desatero_2.gif";
imgsrc[13] = "images/Tlac_Onas_1.gif";
imgsrc[14] = "images/Tlac_Onas_2.gif";
imgsrc[15] = "images/Tlac_Katalog_1.gif";
imgsrc[16] = "images/Tlac_Katalog_2.gif";
if (getAppVersion()) {
img = new Array();
for (i = 0; i < imgsrc.length; i++) {
img[i] = new Image();
img[i].src = imgsrc[i];
}
}