Join multiple pdf documents in vb script

Hi,

I have vb script to join two pdf documents together. Works great. I can't seem to expand the code to join three (or more) pdf docs together. Each pdf is one page.

I have
Dim Doc1
Dim Doc2
Dim Doc3

Set Doc1 = CreateObject("AcroExch.PDDoc")
Set Doc2 = CreateObject("AcroExch.PDDoc")
Set Doc3 = CreateObject("AcroExch.PDDoc")



file1 = Doc1.Open("C:\ods_outputs\alc_daily_summary_tables.pdf")
file2 = Doc2.Open("C:\ods_outputs\discharge destinations.pdf")
file3 = Doc3.Open("C:\ods_outputs\alc_daily_graphs.pdf")
Stack = Doc1.InsertPages(Doc1.GetNumPages - 1, Doc2, Doc2.GetNumPages,0, Doc3, 0, Doc3.GetNumPages,0)

SaveStack = Doc1.Save(1, "C:\Users\LB\Desktop\Daily v2.pdf")

I get error: wrong number of arguments or invalid property assignment.
I can't find the meaning of the arguments...If you could explain them, that would help.

Can you help me straighten this out.

Thanks,

Bruce