app/assets/javascripts/your_platform/page_settings_teaser_image.js.coffee
$(document).on 'click', '#select_teaser_image img', ->
img = $(this)
new_image_url = img.attr('src')
$('#select_teaser_image img').removeClass 'active'
img.addClass 'active'
$('#select_teaser_image .best_in_place').click()
setTimeout ->
$('#select_teaser_image .best_in_place input').val new_image_url
unless $('#select_teaser_image').closest('.box').hasClass('currently_in_edit_mode')
$('#select_teaser_image .best_in_place').trigger 'save'
, 100