How can I turn off the Yahoo pop-up blocker sound?

Yesterday I asked a similar question, and got quick answers. Thought I had it solved...alas, no. That annoying door creak/slam thing is on both Yahoo toolbars, because I just switched back to the old one, and it's from Yahoo's own pop-up blocker program. Run the test and you'll hear the sound that's worse than fingernails on a chalkboard. Checked or unchecked, there's that SOUND. How can I turn that off? Just block the pop-ups is all...