function init_image_fields()
{
  var inputs = document.getElementsByTagName('input');
  for(var i = 0; i < inputs.length; i++)
  {
    if(inputs[i].className.match(/imageField/) && typeof inputs[i].gogoJS_ImagePicker == 'undefined')
    {
      // Got one.
      inputs[i].gogoJS_ImagePicker = new ImagePicker(inputs[i]);
    }
  }
}