"is it possible?" is always the wrong question ;-) Two basic ways I would think of and both require some work and knowledge on your end:
Extend the favoritesClass in your theme's functions.php or a custom plugin. Then override the original ad_removeButton()class method with your own in your child class.
Use CSS via your theme to add an image in the background of the button which is not a <button> but a <input type="submit">.
Comments
"is it possible?" is always the wrong question ;-) Two basic ways I would think of and both require some work and knowledge on your end:
favoritesClass
in your theme's functions.php or a custom plugin. Then override the originalad_removeButton()
class method with your own in your child class.<button>
but a<input type="submit">
.