function showSubmenu(event, submenuId)
{
	if(!event)
		event = window.event;

	mainMenu =(event.target) ? event.target : event.srcElement;

	subMenu = document.getElementById(submenuId);
	
	subMenu.style.display = 'block';

}

function hideSubmenu(submenuId)
{
	subMenu = document.getElementById(submenuId);
	subMenu.style.display = 'none';
}