function showaantal(dag)
{
	document.getElementById('agenda_aantal').innerHTML = '<h5>'+dag+'</h5>';
}

function clear_agenda_aantal()
{
	document.getElementById('agenda_aantal').innerHTML = '<h5></h5>';
}

var div_inhoud = '';
var teller = 0;

function add_extra()
{	
	if(div_inhoud == '')
	{
		div_inhoud = document.getElementById('basic_element').innerHTML;
	}
	
	new_div_inhoud = div_inhoud;
	
	huidig = document.getElementById('basic_element').innerHTML;
	
	new_div_inhoud = new_div_inhoud.replace("cath","cath"+teller);
	new_div_inhoud = new_div_inhoud.replace("subcath","subcath"+teller);
	
	document.getElementById('basic_element').innerHTML = huidig + new_div_inhoud;
	teller++;
}