Nebandžiau nei vieno varianto, bet aš bandyčiau kažką tokio.
var logo = document.getElementById("logo");
var photo = document.getElementById("photo");
logo.onclick = onClickLocation();
photo.onclick = onClickLocation();
function onClickLocation () {
window.location.href = '/';
}
arba
onClickLocation("logo");
onClickLocation("photo)"
function onClickLocation ( id ) {
var element = document.getElementById(id);
element.onclick = function () {
window.location.href = '/'
};
}