Create a module-level variable and store "Index" in there. Something like:
VB Code:
  1. Option Explicit
  2.     Private myIndex As Integer
  3.  
  4. Private Sub Picture4_MouseMove(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
  5.     myIndex = Index
  6. End Sub
  7.  
  8. Private Sub Command1_Click()
  9.     'use the "myIndex" here...
  10. End Sub