function switchid (id)
{
	var divs = document.getElementsByTagName('div');
	for (var x = 0; x < divs.length; x++)
	{
		if (/^a(\d+)$/i.test(divs[x].id))
		{
			divs[x].style.display = (divs[x].id == id ? 'block' : 'none');
		}
	}
}