John
You could also look at the Irish Family History Foundation site at
http://ifhf.brsgenealogy.com/index.php. You will have to register but this is 'free'. Then go to co Louth on the map and put in the surnames
only of each party to the marriage. You can then go throught the list of parishes to refine the possibilities. I could find 3 Mary Connolly's in Drogheda but no James Tierney's.
The other possibility is that they may have married at St Mary's, Drogheda which is on the other side of the R. Boyne in Co Meath. Unfortunately the records for Meath are not on line yet.
If you wish to look at the record is will cost you €5.00!!!
HTH
Stuart