function showDescription( content )
{
	var insertionPoint = document.getElementById( "insertionpoint" );
	oldChild = insertionPoint.firstChild;
	var newChild = document.createTextNode( content );
	
	if( oldChild )
	{
		insertionPoint.replaceChild( newChild, oldChild );
	}
	else
	{
		insertionPoint.appendChild( newChild, oldChild );
	}
}

function hideDescription()
{
	var insertionPoint = document.getElementById( "insertionpoint" );
	var oldChild = insertionPoint.firstChild;
	var removed = insertionPoint.removeChild( oldChild );
}