var shown = new Array();
function toggle_display(id)
{
	var block = document.getElementById(id);
	var hidelink = document.getElementById(id + 'hide');
	var showlink = document.getElementById(id + 'show');
	if (shown[id])
	{
		block.style.display="none";
		block.style.visibility="hidden";
		if (hidelink)
		{
			hidelink.style.display="none";
			hidelink.style.visibility="hidden";
		}
		if (showlink)
		{
			showlink.style.display="inline";
			showlink.style.visibility="visible";
		}
		shown[id] = false;
	}
	else
	{
		block.style.display="block";
		block.style.visibility="visible";
		if (hidelink)
		{
			hidelink.style.display="inline";
			hidelink.style.visibility="visible";
		}
		if (showlink)
		{
			showlink.style.display="none";
			showlink.style.visibility="hidden";
		}
		shown[id] = true;
	}
}

function toggle_bb_options(dropdown)
{
	var options3_block = document.getElementById('options3');
	switch (dropdown.options[dropdown.selectedIndex].value)
	{
		case '2':
			options3_block.style.display="none";
			options3_block.style.visibility="hidden";
		break;
		case '3':
			options3_block.style.display="block";
			options3_block.style.visibility="visible";
		break;
	}
}