ARGH!!!

Why does the following function call not work?
VBA keeps telling me that an "=" is expected?

Dim Ore_Name As String
Dim ws_index As Integer

Ore_Name = "Carbon"
ws_index = 3

Find_Ore_And_Setup_Grid(Ore_Name, ws_index) ' <=== This line will NOT compile
Function Find_Ore_And_Setup_Grid(o_name As String, ws_index As Integer)
' Will search the indexed ws of the GPI_wb for the Ore name, if not found then it will be created with needed grid
  

End Function