Is it possible to have two or more pictures shown in a task tab, and let the user pick one of them by means of a radiobutton group?
Ideally each picture would have a value or label, and the value or label of the chosen picture should be stored in the field attribute.
As it cannot be done by out of the box provided radio button fields, you can do this by coding an HTML separator.
Here is the following sample I wrote for you:
Note: The "YOURATTRIBUTE" attribute which needs to be into the document (screen) andwhich is managed by those radio buttons associated with images can be defined as hidden style.