Chris,
In your css stylesheet you have:
a.button {color: #26779A; font: 18px "MS Sans Serif", Geneva, sans-serif; padding: 0px 10px 0px 0px; text-transform: lowercase; white-space: nowrap;}
a.button img {display: none;}
a.button-add {color: #FF4E00;}
Change the 'a.button img {display: none;}' to 'a.button img {}'
This should correct your issue