function showhide( el ) {
	el = document.getElementById(el);
	if ( el ) el.style.display = ( el.style.display == "none" ) ? "block" : "none";
}

function show( el ) {
	el = document.getElementById(el);
	if ( el ) el.style.display = "block";
}

function hide( el ) {
	el = document.getElementById(el);
	if ( el ) el.style.display = "none";
}



  var offset_top = 0;
  var offset_left = 0;
  var offset = 0;
  var t;
  var current_desc = 0;

  function get_top( e ) {
    e = document.getElementById(e);
    return get_top_coord(e, 0);
  }

  function get_left( e ) {
    e = document.getElementById(e);
    return get_left_coord(e, 0);
  }

  function get_top_coord( el, offset ) {
   if ( el.offsetParent ) offset += get_top_coord(el.offsetParent, offset);
   offset += el.offsetTop;
   return offset;
  }

  function get_left_coord( el, offset ) {
   if ( el.offsetParent ) offset += get_left_coord(el.offsetParent, offset);
   offset += el.offsetLeft;
   return offset;
  }

  function show_pop() {
    el = document.getElementById("pop");

    el.style.top = get_top("pop_title") + 20;
    el.style.left = get_left("pop_title");
    el.style.display = ( el.style.display == "none" ) ? "block" : "none";
  }


  function show_desc( desc_id ) {

    if ( current_desc > 0 ) {
     el = document.getElementById("desc" + current_desc);
     el.style.display = "none";
    }
    if ( desc_id == current_desc ) return;
    current_desc = desc_id;

    el = document.getElementById("desc" + desc_id);
 
    el.style.top = get_top("item" + desc_id) + 18;
    el.style.left = get_left("item" + desc_id) + 35;
    el.style.display = ( el.style.display == "none" ) ? "block" : "none";
  }