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] = "img/rodokmen.gif"; 
imgsrc[2] = "img/rodokmen_n.gif"; 
imgsrc[3] = "img/vycvik.gif"; 
imgsrc[4] = "img/vycvik_n.gif";
imgsrc[5] = "img/zkousky.gif"; 
imgsrc[6] = "img/zkousky_n.gif";
imgsrc[7] = "img/vystavy.gif"; 
imgsrc[8] = "img/vystavy_n.gif"; 
imgsrc[9] = "img/foto.gif"; 
imgsrc[10] = "img/foto_n.gif";
imgsrc[11] = "img/standard.gif"; 
imgsrc[12] = "img/standard_n.gif";
imgsrc[13] = "img/stenata.gif"; 
imgsrc[14] = "img/stenata_n.gif";
imgsrc[15] = "img/odkazy.gif"; 
imgsrc[16] = "img/odkazy_n.gif";


imgsrc[20] = "img/cz.gif"; 
imgsrc[21] = "img/cz_n.gif"; 
imgsrc[22] = "img/en.gif"; 
imgsrc[23] = "img/en_n.gif";

imgsrc[24] = "img/rodokmen_en.gif"; 
imgsrc[25] = "img/rodokmen_en_n.gif"; 
imgsrc[26] = "img/vycvik_en.gif"; 
imgsrc[27] = "img/vycvik_en_n.gif";
imgsrc[28] = "img/zkousky_en.gif"; 
imgsrc[29] = "img/zkousky_en_n.gif";
imgsrc[30] = "img/vystavy_en.gif"; 
imgsrc[31] = "img/vystavy_en_n.gif"; 
imgsrc[32] = "img/foto_en.gif"; 
imgsrc[33] = "img/foto_en_n.gif";
imgsrc[34] = "img/standard_en.gif"; 
imgsrc[35] = "img/standard_en_n.gif";
imgsrc[36] = "img/stenata_en.gif"; 
imgsrc[37] = "img/stenata_en_n.gif";
imgsrc[38] = "img/odkazy_en.gif"; 
imgsrc[39] = "img/odkazy_en_n.gif";

imgsrc[46] = "img/felis.gif";
imgsrc[47] = "img/felis.gif";
imgsrc[48] = "img/anny.gif";
imgsrc[49] = "img/anny.gif";


if (getAppVersion()) {
img = new Array();
for (i = 0; i < imgsrc.length; i++) {
img[i] = new Image();
img[i].src = imgsrc[i];
}
}