visibleAgenda = "festivals";

function agendaSwitch(which, bgColor, bg)
{
	document.getElementById(visibleAgenda).style.display="none";
	document.getElementById("agenda").style.background="#"+bgColor+" url('http://sites.3fm.nl/data/media/"+bg+"') no-repeat;";
	document.getElementById(which).style.display="block";
	
	visibleAgenda = which;
}