Unexpected 'for'????

var arr = new Array("nrs", "naam", "adres", "tel", "email", "activiteiten", "leeftijd", "functie", "fotos", "extra", "lidsinds");
window.onload = function () {
    fotos = document.getElementsByClassName("foto");
    for (i = 0; i < fotos.length; +=1) {
        fotos[i].onclick = function (event) {
            var body = document.getElementsByTagName("body")[0];
            var div = document.createElement("div");
            div.setAttribute("id", "fotoke");
            div.setAttribute("style", "width:100%;height:100%;top:0;left:0;position:fixed;");
            var img =  document.createElement("img");
            img.setAttribute("src", event.target.src.replace("small",""));
            div.appendChild(img);
            body.appendChild(div);
            div.onclick = function (e) {
                document.body.removeChild(document.getElementById("fotoke"));
            }
        }
    }
};