[html-formfu] Adding a static image block

[Alan Hicks]

Hi,

Is there a best practice to add a static image to a form that is 
accessible at runtime?

The image is a captcha image and needs to have the src attribute added 
at runtime since the location changes depending on the referrer.

The yaml extract is as follows

   - type: block
     id: captcha_image
     tag: img

If the yaml file contains attributes_xml: {src: 
http://localhost:3000/feedback/captcha} all works ok with the rendered 
tag as <img id="captcha_image" 
src="http://localhost:3000/feedback/captcha"></img>

As the block does not appear to have a name tag I don't seem able to 
find it easily with get_element().

Thanks,
Alan