// POZOR, v IE getElementById nehlada podla id, ale najprv podla name

function elemShow(elem_id)
{
	if(document.getElementById(elem_id))
		document.getElementById(elem_id).style.display = "block";
}

function elemHide(elem_id)
{
	if(document.getElementById(elem_id))
		document.getElementById(elem_id).style.display = "none";
}

function elemSwitch(elem_id)
{
	if(document.getElementById(elem_id))
	{
		if (document.getElementById(elem_id).style.display != "block")
			document.getElementById(elem_id).style.display = "block";
		else
			document.getElementById(elem_id).style.display = "none";
	}
}

function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}