بسم الله و الحمد لله و الصلاة و السلام على رسول الله

You can download this app from here
You will notice in the report source
img tag which has class="image"
Please, edit page 1 and go the Header section, then you will see the class.

This application is based on EMP table, and we need to add 4 columns to emp table.
Alter table emp add (filesize varchar2 (4000), mimetype varchar2 (4000), content blob, filename varchar2 (4000))