var a=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1); <!--0303, 0218, 0204, 0128, 0121, 0114, 0105, 1231/11, 1227, 1225, 1223, 1221, 1219, 1218, 1217, 1216, 1215-->
var b=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1); <!--xxxx, xxxx  xxxx, xxxx, xxxx, xxxx, xxxx  xxxxxxx        xxxx              xxxx                    xxxx
var c=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1);
var d=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1);
var e=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1);
var f=new Array(17, 16, 15, 14, 13, 12, 11, 10, 8, 5, 1);

function ZetFoto()
{
	document.images["st"].src = "st" + a[0] + ".jpg"
	document.images["ar"].src = "ar" + b[0] + ".jpg"
	document.images["ye"].src = "ye" + c[0] + ".jpg"
	document.images["ho"].src = "ho" + d[0] + ".jpg"
	document.images["ta"].src = "ta" + e[0] + ".jpg"
	document.images["iz"].src = "iz" + f[0] + ".jpg"
}

function volgende(id)
{
	var foto = document.images[id].src;
	var nr = foto.substr(foto.lastIndexOf("/") + 3);
	nr = nr.substr(0, nr.lastIndexOf(".")) ;
	var nieuw = haalNieuwNummer(id, nr);
	document.images[id].src = id + nieuw + ".jpg"
}

function haalNieuwNummer(id, nr)
{
	var x = new Array();
	x = haalArray(id);
	var indeks = haalIndeks(x, nr);
	if (indeks == x.length-1) {indeks = 0 }
	else { indeks++;}
	return x[indeks];
}

function haalIndeks(x, nr)
{
	var i=0;
	var j = 0;
	for ( i = 0; i < x.length; i++)
	{
		if (x[i] == nr) { j = i; }
	}
	return j;
}

function haalArray(id)
{
	x = new Array();
	if (id=="st"){ x = a; }
	if (id=="ar"){ x = b; }
	if (id=="ye"){ x = c; }
	if (id=="ho"){ x = d; }
	if (id=="ta"){ x = e; }
	if (id=="iz"){ x = f; }

	return x;
}