function showhide(id, visible)
{
	if (visible == undefined)
		visible = 'block';

	if (document.getElementById)
	{
		if (document.getElementById(id).style.display == 'none')
			document.getElementById(id).style.display = visible;
		else
			document.getElementById(id).style.display = 'none';
	}
	else
	{
		if (document.layers)
		{
			if (document.id.display == 'none')
				document.id.display = visible;
			else
				document.id.display = 'none';
		}
		else
		{
			if (document.all.id.style.display == 'none')
				document.all.id.style.display = visible;
			else
				document.all.id.style.display = 'none';
		}
	}
}