using number from detailTextLable

Hey.

i have put in a button in the tableView cell, and i am pub. the cell wit a "name" and the detailTextLabel wit a number, from my core data model.

i want to add the number to a entity called ToDo with a attribute called totalPoint ( int16)

lets say the detailText is set to 15 ( witch is stored in a string)

i want 15 to be added to totalPoint, so if lets say the totalPoints == 40
the app will load a UIAlertView. msg.

hope u can help me out :-D

Thanks
Skov