The collection description says:
"Name index and images of Massachusetts statewide marriage registers. The marriage registers are in numbered volumes arranged by year then by individual town. Currently only marriages for the years 1896, 1897 and 1906-1915 are available."
I input "Seaver" in the last name field on the search box, and received 445 matches. Here is the screen with the "mouse-over" popup box for the first person on the list:
This record image can be magnified using the + and - buttons on the small thumbnail image, which shows in yellow the portion of the image displayed on the screen. The user can manipulate the image using their left-mouse button to move the image with the "magic hand" around the screen.