function afb(id, actie)
{
	if (actie == 'show')
	{
			document.getElementById('kaart').src = 'images/stromen/kaarten/'+id+'.gif';
	}
	if (actie == 'hide')
	{
			document.getElementById('kaart').src = 'images/stromen/kaarten/default.gif';
	}
}

active_content = '';

function content(id, actie)
{
	if (actie == 'show')
	{
		if (active_content == '')
		{
			document.getElementById('default_content').style.display = 'none';			
			document.getElementById(id).style.display = 'block';
			active_content = id;
		}
		else
		{
			if(id == 'nederland_content_2')
			{
				document.getElementById('nederland_content').style.display = 'block';
				document.getElementById('nederland_content_1').style.display = 'none';
				document.getElementById('nederland_content_2').style.display = 'block';
			}
			else if(id == 'nederland_content_1')
			{
				document.getElementById('nederland_content').style.display = 'block';
				document.getElementById('nederland_content_2').style.display = 'none';
				document.getElementById('nederland_content_1').style.display = 'block';
			}
			else
			{
			document.getElementById(active_content).style.display = 'none';
			document.getElementById(id).style.display = 'block';
			active_content = id;
			}
		}
	}
}