refresh icon by function/macro

[_pi]

i have a tiny desktop bar with a dialup button and want to
change the icon by status.
so how to refresh an icon on a bar ?

Code:

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str con = "tiscali"
str onico ="$my qm$\online\online.ico"
str offico ="$my qm$\online\offline.ico"
str status = "$my qm$\online\status.ico"
if !IntIsConnected(con)
,cop- offico status
else
,cop- onico status