function showSub(c, id, a) {
	           var _realyShow = (a.className == 'active ex') ? false : true;
	
	           // shovame vsechny
	           for (i = 1; i <= c; i++) {
		          if (obj = document.getElementById('sublm'+i))
			         obj.style.display = 'none';
		          if (obj = document.getElementById('alm'+i)) 
			         obj.className = 'ex';
	           }
	
	           // pokud 
	           if (document.getElementById('sub'+id)) {
		          if (_realyShow) {
		          	document.getElementById('sub'+id).style.display = 'block';
		          	a.className = 'active ex';
		          }
		          return true;
	           }
            return false;
            }