In this old thread (viewtopic.php?uid=49494&f=45&t=47888&start=0), @F3K Total managed to use the "onmouseover" function inside the macro apparently (see the file attached).
I don't see how he did this...
And last question, is it possible to eventually get the source of the hyperlink, as he was asking? (Maybe we can get now that since the thread dates back from 2012)
Thanks a lot for your help!