var hidden = true;

function toggleArchive(archiveId, tag){

	var archive = document.getElementById(archiveId);
	var len = archive.rows.length;
	var archStyle = (!hidden)? "none":"";

	for(i=3 ; i<len-1; i++){
		 archive.rows[i].style.display = archStyle;
	 }

	if(!hidden)
		tag.innerHTML = "Archiv >>";
	else
		tag.innerHTML = "<< Pouze aktuality";
	hidden = !hidden;
}