hi, Michela,
I have similar problem (in different context) with gwt 1.5.3. and
IE6/7 memory leaks. After some findings I found that leaking is caused
by trasparency filter:

style.filter = 'alpha(opacity=0)';

Try to remove transparency effects and then check for memory leaks.

Please, take a look at the issue for details:
http://code.google.com/p/google-web-toolkit/issues/detail?id=2329&q=popuppanel%20leak#c5

--
Matas

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