function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function zetPijltjeBovenaan() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("agenda")) return false;	
  var agenda = document.getElementById("agenda");
  var links = agenda.getElementsByTagName("a");
  var eerstelink = links[0];
  eerstelink.setAttribute("class","hier");
  eerstelink.setAttribute("className","hier");
}

function verplaatsPijltje() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("film")) return false;	
  var film = document.getElementById("film");
  var titel = film.getElementsByTagName("h3");
  var deTitel = titel[0].firstChild.nodeValue;
  var agenda = document.getElementById("agenda");
  var links = agenda.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
	var agendaTitel = links[i].firstChild.firstChild.nodeValue;
	var deLink = links[i];
	 	if (agendaTitel == deTitel) {
			deLink.setAttribute("class","hier");
  }
  }
}

function agendaInkleuren () {
	var agenda = document.getElementById("agenda");
	var blokjes = agenda.getElementsByTagName("li");
	blokjes[1].style.backgroundColor = "#19738F";
	blokjes[2].style.backgroundColor = "#33839C";
	blokjes[3].style.backgroundColor = "#4D93A8";
	blokjes[4].style.backgroundColor = "#66A2B5";
}

addLoadEvent(zetPijltjeBovenaan);
addLoadEvent(agendaInkleuren);