function zobraz(name) {
    
    Effect.toggle(name,'appear');
    
  	element = document.getElementById(name + '_on').style;
  	element.display = 'none';
  	
  	element = document.getElementById(name + '_off').style;
  	element.display = 'block';
  	
  }
  
  function skryj(name) {
   	
    Effect.toggle(name,'appear');

  	element = document.getElementById(name + '_off').style;
  	element.display = 'none';
  	
  	element = document.getElementById(name + '_on').style;
  	element.display = 'inline';
  
  }
  
  function skryj_simple(name) {
    Effect.toggle(name,'appear');  
  }