replace text in img

[alon0505]

hey, i have a mod and he show like a text in my forum
i want the mod show like img no like text

the code (from Plugin & Products System)

<set id='hegbl_notifications' class='popupmenu' onclick='update_list_notifications();'>
  <span id='notifications_list' style='cursor: pointer;' class='span popupctrl' onclick='update_list_notifications();'>
   <span onclick='update_list_notifications();'>Text xxx </span>
  </span>

so... how i do it ?