You can see the index on LDS films through a Family History Centre:
Church of England marriages-Index Northern Division Ramsey, Maughold, Lezayre, Andreas, Bride, Jurby 1884-1964 Church of England marriages-Index Eastern Division Douglas, Onchan, Lonan, Braddan, Marown 1884-1964 FHL BRITISH Film 454951

Church of England marriages-Index Southern Division Castletown, Malew, Santon, Arbory, Rushen 1884-1964 Church of England marriages-Index Western Division Peel, German, Patrick, Michael, Ballaugh 1884-1964 FHL BRITISH Film 454952

Dissenters marriages index Douglas 1849-1964 Ramsey 1869-1964 Peel 1848-1964 Castletown 1849-1964 FHL BRITISH Film 454953

For a full list of IoM b/m/ds available on film (both index entries and the full certs) see my message at: http://www.isle-of-man.com/cgi-bin/interests/genealogy/bulletin/index.pl?noframes;read=515049

But as Mary will look for you that is best of all!

Sue