var previd = 1;

function showsubmenu(id)
{

	// Handle case of no child menu
	if (id == 0)
	{
		for(i = 1; i <= 7; i++)
		{
			document.getElementById('s' + i).style.display = "none";			
		}
		return;
	}

	// 
	submenu = document.getElementById('s' + id);
	
	// Hide all sub menus, except for the current id
	for (i = 1; i <= 7; i++)
	{
		//submenu.innerHTML = "blah " + previd;
		
		if(i == id)
		{
			submenu.style.display = "block";
		}
		else
		{
			document.getElementById('s' + i).style.display = "none";
		}
	}
	
	previd = id;

}