function zmen_zalozku(zalozka) {


  if (zalozka == 'techlist') {
  
    document.getElementById("techlist").style.display = "";
    document.getElementById("prislusenstvi").style.display = "none";
    
    document.getElementById("techlist_button").style.fontWeight = "bold";
    document.getElementById("prislusenstvi_button").style.fontWeight = "normal";
    
    document.getElementById("techlist_button").style.backgroundImage="url(/picts/bg-techlist-active.png)";
    document.getElementById("prislusenstvi_button").style.backgroundImage="url(/picts/bg-prislusenstvi.png)";
        
  
  } else if (zalozka == 'prislusenstvi') {

    document.getElementById("techlist").style.display = "none";
    document.getElementById("prislusenstvi").style.display = "";
  
    document.getElementById("techlist_button").style.fontWeight = "normal";
    document.getElementById("prislusenstvi_button").style.fontWeight = "bold";

    document.getElementById("techlist_button").style.backgroundImage="url(/picts/bg-techlist.png)";
    document.getElementById("prislusenstvi_button").style.backgroundImage="url(/picts/bg-prislusenstvi-active.png)";
    
  } else if (zalozka == 'diskuze_detail') {

    document.getElementById("techlist").style.display = "none";
    document.getElementById("prislusenstvi").style.display = "none";
  
    document.getElementById("techlist_button").style.fontWeight = "normal";
    document.getElementById("prislusenstvi_button").style.fontWeight = "normal";

    document.getElementById("techlist_button").style.backgroundImage="url(/picts/bg-techlist.png)";
    document.getElementById("prislusenstvi_button").style.backgroundImage="url(/picts/bg-prislusenstvi.png)";
    
  } 
}

function zmen_prislusko(typ, polozka,pocet) {
    for(i=1; i<=pocet; i++) {
      id = ""+typ+i;
      if (document.getElementById(polozka).checked) {
        if (document.getElementById(id)) {
          document.getElementById(id).style.display="";
        }
      }
      else {
        if (document.getElementById(id)) {
          document.getElementById(id).style.display="none";
        }
      }
    }
}