Question ASP Imagemap click event only fires once

[danielsmith00]

I am trying to code a fairly simple web-app that displays full screen powerpoint slides that I have saved as PNG images. I want to be able to click the right half of the image to display the next slide in the rotation, and the left side of the image to move back a slide. I have this nearly working, when I click the right side of the picture, the image changes to the next slide in the rotation. But when I click it again, nothing happens. I can click the left side of the image, and the image changes back to the first slide, but again if I click the right side of the image again, it will advance one slide and no more.

I can move back and forth between the first and second slides with no problem, but for some reason i can't get the array index (i2) to increment more than once with the click event?? I'm sure this is a fairly simple issue, i'm not really a programmer so I don't do this kind of thing every day.

here's some of the code below:

Dim LeftHotSpot As New RectangleHotSpot
LeftHotSpot.Top = HeightInt
LeftHotSpot.Bottom = 0
LeftHotSpot.Left = 0
LeftHotSpot.Right = WidthInt2
LeftHotSpot.PostBackValue = "Left"
LeftHotSpot.AlternateText = "Back"
Dim RightHotSpot As New RectangleHotSpot
RightHotSpot.Top = HeightInt
RightHotSpot.Bottom = 0
RightHotSpot.Left = WidthInt2
RightHotSpot.Right = WidthInt
RightHotSpot.PostBackValue = "Right"
RightHotSpot.AlternateText = "Forward"
htmlImage.HotSpots.Add(LeftHotSpot)
htmlImage.HotSpots.Add(RightHotSpot)
htmlImage.ImageUrl = "sales/1.Png"
For Each FileName As String In System.IO.Directory.GetFiles(FolderPath)

Position = InStr(FileName, ".")
FileName = FileName.Substring(Position)
FileArray(i) = i.ToString + ".png"

i = i + 1

Next
i = i - 1
htmlImage.ImageUrl = "sales/" & FileArray(0)
End Sub

Protected Sub Click_Back(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ImageMapEventArgs) Handles htmlImage.Click
If e.PostBackValue = "Left" Then
i2 = i2 - 1
Else
i2 = i2 + 1

End If

If i2 < 0 Or i2 > i Then
i2 = 0
End If
htmlImage.ImageUrl = "sales/" + FileArray(i2)
End Sub

End Class