Change playbutton

Hello, great music mp 3 player.
At the page its at the right bottom corner.
Now, my client wants this PLAYbutton to replaced by some image…
Is this one way or another possible, just replace it by a .jpg or .png?
(i can see you work with iconsheets…and point out the position of the image on that field with css?).
best regards , jelle vanhijfte, the netherlands

The page I need help with: [log in to see the link]