Record Navigation Buttons

Ok, I am trying to make some sort of thumbnail preview form. The image appears in the imgBox no problem, and it is grabbing it from the field. When I use a combo box to navigate the records it works flawlessly

HOWEVER, I would like my users to be able to press bckwds/fwds arrows so i made some arrows with the wizard and added some code. Heres how it looks

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Private Sub cmdNext_Click()
On Error GoTo Err_cmdNext_Click

DoCmd.GoToRecord , , acNext
Me.Requery
If Me!SamPhoto = "" Or IsNull(Me!SamPhoto) = True Then
imgSamPhoto.Picture = ""
lblNoPhoto.Visible = True
Else
lblNoPhoto.Visible = False
imgSamPhoto.Picture = Me![SamPhoto]
End If
MsgBox Me!SamPhoto
Exit_cmdNext_Click:
Exit Sub

Err_cmdNext_Click:
MsgBox Err.Description
Resume Exit_cmdNext_Click

End Sub

Private Sub cmdPrevious_Click()
On Error GoTo Err_cmdPrevious_Click


DoCmd.GoToRecord , , acPrevious
Me.Requery
If Me!SamPhoto = "" Or IsNull(Me!SamPhoto) = True Then
imgSamPhoto.Picture = ""
lblNoPhoto.Visible = True
Else
lblNoPhoto.Visible = False
imgSamPhoto.Picture = Me![SamPhoto]
End If

Exit_cmdPrevious_Click:
Exit Sub

Err_cmdPrevious_Click:
MsgBox Err.Description
Resume Exit_cmdPrevious_Click

End Sub

Private Sub Form_Load()
DoCmd.GoToRecord , , acFirst
End Sub

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My problem is that it never goes to the second record when i press next, and when i press back it says at end of recordset ( which makes sense ) but why would the back button work, and the fwd button do nothing ? I am hoping it is a small syntax error. Please help!