var topMenu = null;
var topMenuTimeout = null;
function showTopMenu(menu_id){
	clearTimeout(topMenuTimeout);
	if(topMenu != null){
		topMenu.style.display = 'none';
		topMenu = null;
	}
	
	topMenuButton = document.getElementById(menu_id);
	topMenu = document.getElementById('sub_' + menu_id);
	if(topMenu){
		topMenu.style.top = getRealTop(topMenuButton) + 22 + 'px';
		topMenu.style.left = getRealLeft(topMenuButton) + 1 + 'px';
		topMenu.style.display = 'block';
	}
}

function hideTopMenu(){
	if(topMenu != null){
		topMenu.style.display = 'none';
		topMenu = null;
	}
}