function zakelijkclicked() {
	document.getElementById('selzakelijk').innerHTML = "● ";
	document.getElementById('selparticulier').innerHTML = "";
}

function particulierclicked() {
	document.getElementById('selzakelijk').innerHTML = "";
	document.getElementById('selparticulier').innerHTML = "● ";
}

sfHover = function() {
var sfEls = document.getElementById("navtop").getElementsByTagName("LI");
for (var i=0; i < sfEls.length; i++) {
sfEls[i].onmouseover=function() {
this.className+=" over";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp(" over\\b"), "");
}
}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);