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";
	}
}
function select_year(base,extension){
	var year = document.getElementById("FORM_year").value;
	
	window.location.href= base + 'activiteitenkalender/' + year + '.' + extension;
}
window.addEvent('domready', function(){
	externalLinks();
});