You can definitely change the picture of your bitton upon clicking, try these codes and play with the images. But first you have to prepare the image in JPEG.
IF THIS.Picture = "c:\images\edit.jpg"
THIS.Picture = "c:\images\save.jpg"
THISFORM.cmdClose.Picture = "c:\images\cancel.jpg"
ELSE
IF THISFORM.Combo1.Value = 'PESO'
lAnswer = MESSAGEBOX("Save changes?", 4, "Confirmation")
IF lAnswer = 6
THISFORM.cmdClose.Picture = "c:\images\close.jpg"
THISFORM.cmdEdit.Picture = "c:\images\edit.jpg"
ENDIF
ELSE THISFORM.COMBO1.Value = 'DOLLAR'
lAnswer = MESSAGEBOX("Save changes?", 4, "Confirmation")
IF lAnswer = 6
THISFORM.cmdClose.Picture = "c:\images\close.jpg"
THISFORM.cmdEdit.Picture = "c:\images\edit.jpg"
ENDIF
ENDIF
ENDIF