function hide_maincurrent() {
	if (document.getElementById('maincurrent')) document.getElementById('maincurrent').className="";	
	hide_subcurrent();
}

function show_maincurrent() {
	if (document.getElementById('maincurrent')) document.getElementById('maincurrent').className="current";	
	show_subcurrent();
}

function hide_subcurrent() {
  if (document.getElementById('first_mainsubcurrent')) document.getElementById('first_mainsubcurrent').className="first";	
  if (document.getElementById('mainsubcurrent')) document.getElementById('mainsubcurrent').className="";
  if (document.getElementById('last_mainsubcurrent')) document.getElementById('last_mainsubcurrent').className="last"; 
  if (document.getElementById('subcurrent')) document.getElementById('subcurrent').className="";
}

function show_subcurrent() {
	if (document.getElementById('first_mainsubcurrent')) document.getElementById('first_mainsubcurrent').className="first current";	
	if (document.getElementById('mainsubcurrent')) document.getElementById('mainsubcurrent').className="current";
	if (document.getElementById('last_mainsubcurrent')) document.getElementById('last_mainsubcurrent').className="last current"; 
	if (document.getElementById('subcurrent')) document.getElementById('subcurrent').className="current"; 
}