Yet another option.
1. Put ONCE the loader into a custom property
on mouseUp
answer file "input your loader.gif"
if it is empty then exit mouseUp
put base64Encode(url("binfile:"&it)) into ii
replace linefeed with empty in ii
set the loader of this card to compress(ii)
end mouseUp
-- this has now at about the original size of the gif
2. Display the loader as follows.
on mouseUp
set the htmltext of widget "browser" to \
"<img src='data:image/gif;base64," & \
decompress(the loader of this card) & "'>"
end mouseUp
-- optionally add width and height attributes
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