add picture to task contact

[juanykty]

I'm trying to add a line of code to show a picture of the contacts assigned to a task like this

I use this code

                                    <img src="/images/<?php echo $AppUI->___(@$obj->username);?>.jpg" width=" 100px" >

but when I add two or more people ony appear one image, can you help me to do this update? thanks

[juanykty]

I add this code
echo '<td class="hilite"><img src=/images/' . $AppUI->___($contact_data['contact_first_name'].''.$contact_data['']) .'.jpg width="100px"></td>';
on the file /modules/tasks/view.php