Dear Pedro,

you can check the object with this expression
if TYPE('oform.image1') = "O" then
** write the code here to remove the object
else
** write the code here if the object doesnot exists
endif

Where 'oForm' is the refrence to the form and 'image1' is the name of the image object.

Hope this will help you out.

Regards

Vishal Malhotra