function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
	anchor.target = "_blank";
 }
}
window.onload = externalLinks;

function showUitleg(){
	$('.titel').click(function(){
		$(this).next('.uitleg').slideToggle();
	});
}