function show_block ( block_id ) {
 	document.getElementById ( block_id ).style.display = "block";
 } 
function hide_block ( block_id ) {
	document.getElementById ( block_id ).style.display = "none";
}
function outliner(childID, polozka) {
	var child = hodnota = document.getElementById ( childID );
	var polozka = hodnota = document.getElementById ( polozka );
 	if (child.className == "collapsed") {
    	child.className = "expanded";
		polozka.className = "polozka3";
  	}
  	else {
    	child.className = "collapsed";
		polozka.className = "polozka";
  	}
}

function get_img(childID) {
 var child = hodnota = document.getElementById ( childID );
  if (child.className == "collapsed") {
    document.write = "cplus";
  }
  else {
    document.write = "cminus";
  }
}