/*
	Timeline text script
 */


var supported = (document.getElementById || document.all);

if (supported)
{
	document.write("<STYLE TYPE='text/css'>");
	document.write(".timeline_text {display: none}");
	document.write("</STYLE>");

	var minYear = 1800;
	var maxYear = 2020;
	var shown = new Array();
	for (var year=minYear; year<=maxYear; year=year+10)
	{
		shown[year] = false;
	}

}

function blocking(year)
{
	if (!supported)
	{
		return;
	}
	shown[year] = (shown[year]) ? false : true;
	current = (shown[year]) ? 'block' : 'none';
	if (document.getElementById)
	{
		document.getElementById('year'+year).style.display = current;
	}
	else if (document.all)
	{
		document.all['year'+year].style.display = current;
	}
}