function stumble_url(url, title) {
  var url = "http://www.stumbleupon.com/submit?" + 
      "url=" + encodeURIComponent(url) + 
      "&title=" + encodeURIComponent(title);
  return url;
}

function stumble_image(link, image){
  link.href = stumble_url('spydentify.com/?'+image.id,
			  subdomain_prompts[image.domain]);
}

function stumble_user(link, user){
  link.href = stumble_url('spydentify.com/user/?'+user.id,
			  user.name);
}