Yes, you can turn the "click" sounds off while using Yahoo! Mail. While we're working on silencing this sound completely, we can offer a temporary fix to turn the audio off. To do so please follow these steps on your Windows XP or Windows 2000:

1. From the "Start" pop-up menu on your desktop, go to "Settings" and select "Control Panel".
2. From this list, pick "Sounds and Audio Devices" (for Windows XP) or "Sounds and Multimedia Properties" (for Windows 2000). A dialog window opens.
3. From the tabs across the top, select "Sounds".
4. Scroll down and you'll find a category called "Windows Explorer". The last item under this heading is "Start Navigation". Click this to highlight it.
5. In the box just below this, called "Sounds," open the pop-up menu and scroll to the top to choose (None).
6. Click the "OK" button to close the dialog window.