function Verze() {
	browser=navigator.appName;
	appversion=navigator.appVersion;
	version=appversion.substring(0,1);
	if ((browser == "Netscape") && (version >= 3)) return 1;
	if ((browser == "Microsoft Internet Explorer") && (version >=4)) return 1;
	return 0;
}

// pole obrazku _g = zesedly obrazek
imgsrc = new Array();
imgsrc[0] = "images/onas.jpg";
imgsrc[1] = "images/onas_a.jpg";
imgsrc[2] = "images/reference.jpg";
imgsrc[3] = "images/reference_a.jpg";
imgsrc[4] = "images/servis.jpg";
imgsrc[5] = "images/servis_a.jpg";
imgsrc[6] = "images/sluzby.jpg";
imgsrc[7] = "images/sluzby_a.jpg";
imgsrc[8] = "images/kontakt.jpg";
imgsrc[9] = "images/kontakt_a.jpg";


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

function toggle(obrid,id,id_image) {
  if (id.style.display=="block") {
   id.style.display="none";
   obrid.src=imgsrc[id_image];
  } else {
   id.style.display="block";
   obrid.src=imgsrc[id_image+1];
  }
 }