var activeSubmenu	= null;

function showSub( id )
{
	document.getElementById( id ).style.display	= 'block';
	
	activeSubmenu	= id;
}

function hideSub( id )
{
	setTimeout( "finishHideSub('" + id + "');", 500 );
}

function finishHideSub( id )
{
	if( activeSubmenu != id )
	{
		document.getElementById( id ).style.display	= 'none';
	}
}