As I wrote in my last message, if you are in the IoM you can look at the film of the parish register in the MM Library.
If you are not in the IoM you can see LDS film no. 0106194 through any LDS Family History Centre. See under Church of Jesus Christ of Latter Day Saints, in the phone book.
If you want this to be done for you, you can buy a copy of the marriage entry through the Registry: http://www.gov.im/registries/general/civilregistry/
Email = civil@registry.gov.im

Sue