[BioC] topGO w/custom annotation

[Sebastien Gerega]

Hi,
I would like to identify overrepresented GO in my dataset using the 
topGO package.
I am working with a C. neoformans oligo array and have the GO annotation 
in a list with the following format:

$`162.m02116`
[1] GO:0009536
4026 Levels: GO:0 GO:00 GO:000 GO:0000 GO:00000 GO:000000 GO:0000001 
GO:0000002 GO:0000004 GO:0000006 GO:0000009 GO:0000010 ... GO:0051861

$`162.m02150`
[1] GO:0009536
4026 Levels: GO:0 GO:00 GO:000 GO:0000 GO:00000 GO:000000 GO:0000001 
GO:0000002 GO:0000004 GO:0000006 GO:0000009 GO:0000010 ... GO:0051861

$`162.m02156`
[1] GO:0005554 GO:0008372 GO:0000004
4026 Levels: GO:0 GO:00 GO:000 GO:0000 GO:00000 GO:000000 GO:0000001 
GO:0000002 GO:0000004 GO:0000006 GO:0000009 GO:0000010 ... GO:0051861

How do I go about creating the GOdata object?

GOdata = new("topGOdata",
            ontology = "MF",
            allGenes = selectedList,
            annot = annFUN.GO2genes,  ## the new annotation function
            GO2genes = myGO2genes)    ## the GO to gene ID's dataset

Specifically what do I use for the annotation function? It is unclear to 
me how to write this aspect.
Am I correct in understanding that I supply my list as the final argument?
thanks,
Sebastien