function showBox( idBox ) {

	var defBoxKralovna		= document.getElementById("boxKralovna");
	var defLinkKralovna		= document.getElementById("linkKralovna");

	var defBoxPelikan		= document.getElementById("boxPelikan");
	var defLinkPelikan		= document.getElementById("linkPelikan");

	var defBoxLetuska		= document.getElementById("boxLetuska");
	var defLinkLetuska		= document.getElementById("linkLetuska");

	defBoxKralovna.style.display	= "none";
	defBoxPelikan.style.display	= "none";
	defBoxLetuska.style.display	= "none";

	defLinkKralovna.className	= "";
	defLinkPelikan.className	= "";
	defLinkLetuska.className	= "";

	document.getElementById("box"+idBox).style.display	= "block";
	document.getElementById("link"+idBox).className		= "active";

	return false;

}