Thread:Extension talk:SectionHide/Images for the toggles?

Is there a way to change the "show" and "hide" toggles to images (like arrows)? I've tried editing SectionHideHooks.php to remove the brackets (worked), and then SectionHide.i18n.php to replace the text with HTML img src links, but I'm not very good with PHP and JS: while the images do display, there's a bunch of garbled text around them, so I'm guessing there's something going on where I can't just insert images there that easily. I looked through SectionHideHooks.php and tried various things but nothing worked. Thanks!