function init()
{
	var control = document.getElementById( 'layercontrol' );
	control.style.visibility = 'hidden';
	
	init_agi();
	run_agi();
}

function switch_layer( n )
{
	var el = document.getElementById( 'layer' + n );
	
	if ( el.style.visibility == 'hidden' )
	{
		el.style.visibility = 'visible';
	}
	else
	{
		el.style.visibility = 'hidden';
	}
}