function buitenlinks() {
if (document.getElementsByTagName) {
	anchors = document.getElementsByTagName("a");
	for (i=0; i<anchors.length; i++) {
		anchor = anchors[i];
		if ((anchor.getAttribute("href")) && (anchor.className=="vergroten")){
			anchor.title = anchor.title + " (klik om te vergroten)";
		}
	} 
}
}
window.onload = buitenlinks;