timehide = 0;
curshow = '';
function tt_show(id)
{
	clearInterval(timehide);
  if(curshow) tt_hide_(curshow);
	$('#'+id).css('visibility','visible');
	curshow = id;
}
function tt_hide(id)
{
	timehide = setInterval('tt_hide_(\''+id+'\')', 500);
}
function tt_hide_(id)
{
	$('#'+id).css('visibility','hidden');
}