<!--

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/menu/uvod.gif";
imgsrc[2] = "images/menu/uvod_over.gif";
imgsrc[3] = "images/menu/spolecnost.gif";
imgsrc[4] = "images/menu/spolecnost_over.gif";
imgsrc[5] = "images/menu/technologie.gif";
imgsrc[6] = "images/menu/technologie_over.gif";
imgsrc[7] = "images/menu/reference.gif";
imgsrc[8] = "images/menu/reference_over.gif";
imgsrc[9] = "images/menu/kontakt.gif";
imgsrc[10] = "images/menu/kontakt_over.gif";


if (getAppVersion()) {
  img = new Array(); 
  for (i = 0; i < imgsrc.length; i++) {    
   img[i] = new Image();
   img[i].src = imgsrc[i];  
  }
}
//-->