Gettting Primary Key Values In A DML CREATE TRIGGER

I would like to get the primary key values in a DML CREATE TRIGGER as follows:

CustomerID = 12 AND InvoiceID = 50

I create the DML trigger for UPDATE and DELETE only, how do I retrieve the values as above ?

Jon Galloway provided a sample in http://weblogs.asp.net/jgalloway/archive/2008/01.aspx but the Primary Key Field and Primary Key Value were inserted into separate columns while I need to combine the Primary Key Field and Primary Key Value into 1 single field, using his example, I want to form the primary key as:

ScoreId = 423

ScoreId = 3064

etc.

Note that his example only show a single primary key in a table whereas I need to handle multiple primary keys in a table.