window.onload = Laduj;

   function Pokaz01()
   {
      var div = document.getElementById('ukrywane01');
      var elements = div.getElementsByTagName('table');
      for (var i01 = 0; i01 < elements.length ; i01++ )
      {
         elements[i01].style.display = "block";
      }
   }

   function Ukryj01()
   {
      var div = document.getElementById('ukrywane01');
      var elements = div.getElementsByTagName('table');
      for (var i01 = 0; i01 < elements.length ; i01++ )
      {
         elements[i01].style.display = "none";
      }
   }
    
<!-- _____________________________  -->  
    
	
   function Pokaz02()
   {
      var div = document.getElementById('ukrywane02');
      var elements = div.getElementsByTagName('table');
      for (var i02 = 0; i02 < elements.length ; i02++ )
      {
         elements[i02].style.display = "block";
      }
   }

   function Ukryj02()
   {
      var div = document.getElementById('ukrywane02');
      var elements = div.getElementsByTagName('table');
      for (var i02 = 0; i02 < elements.length ; i02++ )
      {
         elements[i02].style.display = "none";
      }
   }

<!-- _____________________________  -->  
    
	
   function Pokaz03()
   {
      var div = document.getElementById('ukrywane03');
      var elements = div.getElementsByTagName('table');
      for (var i03 = 0; i03 < elements.length ; i03++ )
      {
         elements[i03].style.display = "block";
      }
   }

   function Ukryj03()
   {
      var div = document.getElementById('ukrywane03');
      var elements = div.getElementsByTagName('table');
      for (var i03 = 0; i03 < elements.length ; i03++ )
      {
         elements[i03].style.display = "none";
      }
   }

<!-- _____________________________  -->  

  function Laduj()
   {
      var div = document.getElementById('obszar_aktywny01')
      div.onmouseover = Pokaz01;
      div.onmouseout = Ukryj01;
	  
      var div = document.getElementById('obszar_aktywny03')
      div.onmouseover = Pokaz03;
      div.onmouseout = Ukryj03;
	  
      var div = document.getElementById('obszar_aktywny02')
      div.onmouseover = Pokaz02;
      div.onmouseout = Ukryj02;

   }