var last_one;

function display_hidden(which)
{
	if(last_one == which)
	{
		last_one = 0;
		div = document.getElementById('hidden_'+which)
		if(div)
		{
			Effect.BlindUp('hidden_'+which);
		}
	}
	else
	{
		last_one = which;
		var i = 1;
		var div;
		while(div = document.getElementById('hidden_'+i))
		{
			if(i != which)
			{
				Effect.BlindUp('hidden_'+i);
			}
			i = i + 1;
		}
		div = document.getElementById('hidden_'+which)
		if(div)
		{
			setTimeout("Effect.BlindDown('hidden_"+which+"')", 500);
		}
	}
}