<%= link_to( image_tag( picture_to_assign.url(size: preview_size(size), flatten: true) || "alchemy/missing-image.svg", alt: picture_to_assign.name ), alchemy.assign_admin_essence_pictures_path( picture_id: picture_to_assign.id, content_id: @content ), remote: true, onclick: '$(self).attr("href", "#").off("click"); return false', method: 'put', title: Alchemy.t(:assign_image), class: 'thumbnail_background' ) %>