if (!document.getElementById)
    document.getElementById = function() { return null; }


	
function pokazMenu(submenuId) 
{
    var submenu = document.getElementById(submenuId);
	if (submenu == null) return;
    var display = submenu.style.display;

	//window.alert(display);
	
	if (display == "block") 
	{
		submenu.style.display =  "none";
	} 
	else 
	{
		for (var i=1; i<1000; i++) 
		{
			var sub = document.getElementById("sub"+i);
			if (sub == null) break;
			sub.style.display = "none";
		}
				
		submenu.style.display = "block";

	}
    	//return display;
    
}