var theCurrentRegion = '';

function showRegion(theRegion)
{

	if(theCurrentRegion != '') 
	{ 
		document.getElementById(theCurrentRegion).style.display = 'none';
	}

	if(theRegion)
	{
		document.getElementById(theRegion).style.display = 'block';
	}
	theCurrentRegion = theRegion;
	
}