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

if (supported)
{
  var max = 7;
	var shown = new Array();
	for (var i=1;i<=max;i++)
	{
		shown[i+1] = false;
	}
}



function block_closed(i,gg)
{
	if (!supported)
	{
		alert('This link does not work in your browser.');
		return;
	}
	shown[i] = (shown[i]) ? false : true;
	current = (shown[i]) ? 'block' : 'none';
	img = (shown[i]) ? '/images/dnav_arrow.gif' : '/images/unav_arrow.gif';
	if (document.getElementById)
	{
		document.getElementById(i).style.display = current;
	  document.getElementById(gg).src = img;

	}
	else if (document.all)
	{
		document.all[i].style.display = current;
	}
}


function block_open(i)
{
	if (!supported)
	{
		alert('This link does not work in your browser.');
		return;
	}
	shown[i] = (shown[i]) ? false : true;
	current = (shown[i]) ? 'none' : 'block';
  img = (shown[i]) ? '/images/unav_arrow.gif' : '/images/dnav_arrow.gif';

	if (document.getElementById)
	{
		document.getElementById(i).style.display = current;
	  document.getElementById(gg).src = img;


	}
	else if (document.all)
	{
		document.all[i].style.display = current;
	}
}