Changing background image

How do I change the background image of a form on a button click? I see that the original background image is set by

Me.BackgroundImage = CType(resources.GetObject("$this.BackgroundImage"), System.Drawing.Bitmap)

so how do I tell it to use a different image, I have no idea what that all means... I have an image called bgimage.jpg as the background at the moment, but at certain times I wans to use an image called bgimage2.jpg which is stored in an images folder within the project folder...

Thanks.

VB Code:

Me.BackgroundImage = System.Drawing.Image.FromFile(Application.StartupPath & "\Images\bgimage2.jpg")