oldDiv = ""


function showDiv (divName)
{
	if (!oldDiv == "")
	{
	document.getElementById(oldDiv).style.visibility = 'hidden'
	}
	
	
	document.getElementById(divName).style.visibility = 'visible'
	oldDiv = divName
}

function hideDiv (divName)
{
	document.getElementById(divName).style.visibility = 'hidden'
}