function roll(n) {
  document.getElementById("item"+n).style.visibility = "visible";
}
function pack(n) {
  document.getElementById("item"+n).style.visibility = "hidden";
} 

var lastSubMenu, lngTime
function DisplaySub(blnDisplay){
  if(lastSubMenu == null)return;
  var es = document.getElementById(lastSubMenu);
  if(es){
    if(es.style.display != blnDisplay){
      es.style.display = blnDisplay;
    }
  }
}

function ShowSub(newSubMenu,blnShow){
  lngTime = window.clearTimeout(lngTime);
  if(blnShow){
    if(newSubMenu != lastSubMenu) {
      DisplaySub('none');
      lastSubMenu = newSubMenu;
      DisplaySub('block');
    }else{
      DisplaySub('block');
    }
  }else{
    lngTime = window.setTimeout('DisplaySub(\'none\')', 500);
    lastSubMenu = newSubMenu;
  }
}


function OpenImg(obj, land){
  if(land == 2){
    w = 600
    h = 800
  }else{
    w = 800
    h = 600
  }
  var src = obj.src
  src = src.replace(".jpg", "b.jpg")
  wnd = window.open( src, "image", "width="+w+",height="+h+",status=0,toolbar=0,menubar=0,location=0,resizable=0,scrollbars=0" );
  if( typeof(wnd.focus) == "object" )
  	wnd.focus();
}

window.onload = 
function MenuHead(){
  if (document.all && document.getElementById) {
  	menuHead = document.getElementById("menu");
    for (i=0; i < menuHead.childNodes.length; i++) {
      menuItems = menuHead.childNodes[i];
      if (menuItems.nodeName == "LI") {
        menuItems.onmouseover = 
	        function overItems(){
	          this.className += " over";
	          ShowHideSelect('hidden')
		      }
        menuItems.onmouseout = 
        	function outItems(){
	          this.className = this.className.replace(" over", "");
	          ShowHideSelect('visible')
        	}
      }
    }
  }
}	


//skryje a zobrazi SELECT
function ShowHideSelect(vis){
	sel = document.getElementsByTagName('select');
	for(i = 0; i < sel.length; i++){
    sel[i].style.visibility = vis;
  }
}