var pocet = 1;
		var timer, i, menuId;
		var browser = navigator.appName;
		var dom = document.getElementById ? true : false;
		var ie4 = ((document.all) && (!dom)) ? true : false;
		var ns4 = document.layers ? true : false;
		var opera = navigator.userAgent.indexOf('Opera') != -1 ? true : false;
		var dhtml = dom ? true : ie4 ? true : ns4 ? true : false;
		


		function setVisibility(element,newVisibility) { 
  			if (dhtml) {
    		   if (dom) document.getElementById(element).style.visibility = newVisibility;
    		   else if (ie4) document.all[element].style.visibility = newVisibility;
    		   else if (ns4) eval('document.' + element + '.visibility = newVisibility');
  			}
		}

		function menu() {
  			if (dhtml) {
    		   if (opera) for (i = 1; i <= pocet; i++) document.getElementById('hiddenMenu' + i).style.top = 20;
    		   if (ie4) for (i = 1; i <= pocet; i++) document.all['hiddenMenu' + i].style.top = 18;
    		   setVisibility('menuHolder','visible');
		    }
		}

		function showMenu(id) {
  			if (dhtml) {
    		   clearTimeout(timer);
    		   for (i = 1; i <= pocet; i++) if (i != id) setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + i,'hidden');
    		   setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id,'visible');
  			}
		}

		function hideMenu(id) {
  			if (dhtml) {
    		   menuId = (ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id;
    		   timer = setTimeout("setVisibility(menuId,'hidden')",50);
  			}
		}

		function dontHideMenu() {
  			if (dhtml) clearTimeout(timer);
		}