function rozwindiv(warstwa) {
       if (document.getElementById(warstwa).style.display=='block') {
           document.getElementById(warstwa).style.display='none';
       }
       else {
           document.getElementById(warstwa).style.display='block';
       }
   }
   
  document.write('<style type="text/css">');    
  document.write('div.domtab div{display:none;}<');
  document.write('/s'+'tyle>'); 
  
PREV = 'apteka1'
function changeDisplay(id) {
    if (PREV) {
        PREV = document.getElementById(PREV);
        PREV.style.display = "none";
    }
    PREV = id;
    document.getElementById(PREV).style.display = "block";
}