function next(){
	if (current < last - 1) {
		t = document.getElementById('huidig')
		current = current + 1
		t.value = current + 1
		change_p()
	}
	check_and_change()
}
function previous(){
	if (current > 0) {
		t = document.getElementById('huidig')
		current = current - 1
		t.value = current + 1
		change_p()
	}
	check_and_change()
}
function change_p(){
	v = document.getElementById('foto_raam')
	v.src = '../fotos/' + foto_nummers[current] + '.jpg'
}
function check_and_change(){
	p = document.getElementById('prev')
	n = document.getElementById('next')
	if (current == last - 1){
		n.style.color = "#eeeebb"
	} else {
		n.style.color = "#8b9c55"
	}
	if (current == 0){
		p.style.color = "#eeeebb"
	} else {
		p.style.color = "#8b9c55"
	}
}
function druk_af(){
	document.body.focus()
	self.print()
}
function hint_aan(hint, e){
	if (e.layerX) {
		x = parseInt(e.layerX) + 10
		y = parseInt(e.layerY) + 10
	} else {
		x = parseInt(e.x) + 10
		y = parseInt(e.y) + 10
	}
	l = document.getElementById(hint);
	l.style.top = y + "px";
	l.style.left = x + "px";
	l.style.visibility = "visible";
}
function hint_uit(hint){
	layer = document.getElementById(hint);
	layer.style.visibility = "hidden";
}
function venster_op_van_dongen(url){
	window.open(url, 'Van Dongen Info', 'height=300, width=850')
}