//
//  fce ukazuje a schovava podkategorie:
//

iplus = new Image(); iplus.src = "images/plus.gif"
iminus = new Image(); iminus.src = "images/minus.gif"

function SwapKateg(id,img, blok) {
  // stav:
  var obj = new String("i" + id);
  stav = ( ( img.src.indexOf("plus") >= 0 )?true:false )
  if (stav) {
    img.src = iminus.src;
    blok.style.display = "block";
    blok.style.visibility = "visible";
    //window.alert("vprdeli")
  }
  else {
    img.src = iplus.src;
    blok.style.display = "none";
    blok.style.visibility = "hidden";
    //window.alert("vprdeli")
  }
  return;
}