function showSubmenu(page_id, parent_id) {
	if (parent_id != -1) {
		hideSubmenu(parent_id, -1);
	}
	if (document.getElementById) {
		
		var subMenu = document.getElementById('submenu-'+page_id);
		if (subMenu) {
			subMenu.style.visibility = 'visible';
		}
	
		var mainMenuSpan = document.getElementById('main-menu-'+page_id);
		if (mainMenuSpan) {
			mainMenuSpan.style.borderBottom = "1px solid #008b78";
			mainMenuSpan.style.backgroundColor = "#008b78";
		}
	}
}

function hideSubmenu(page_id, parent_id) {
	if (document.getElementById) {
		var subMenu = document.getElementById('submenu-'+page_id);
		if (subMenu) {
			subMenu.style.visibility = 'hidden';
		}

		var mainMenuSpan = document.getElementById('main-menu-'+page_id);
		if (mainMenuSpan) {
			mainMenuSpan.style.borderBottom = "1px solid #5cc6bb";
			mainMenuSpan.style.backgroundColor = "";
		}
	}
	if (parent_id != -1) {
		showSubmenu(parent_id, -1);
	}
}