Sirs:

I have your Cpanel Webmail Module and it works, but when you logout the User Name and Password remain on the Screen.

It does not clear.

I am using Joomla 1.5.2

This is not due to Joomla or to the module, it is due to your browser because it tries to store your login information. Other users or visitors will not have access to that information as it is store locally on your computer.
Do this:
In Firefox press Ctrl+Shift+Del (shortcut to Clear private data),check all those checkboxes and click Clear Private Data Now.
If you do this and browse to your page again you will notice that there is no more information available in the module textboxes. Please reply if this has worked for you.

Thanks for the reply.

But that could not be the answer because if persons use a public computer their e-mail information would be left exposed and even if they manually delete the username and password they are still there.

Your module needs to write "blanks" to the "username" and "password" after the logout if "remember me" is not selected.

Could you do that or could you show me how I could do it. I do not write PHP?

This is not module or Joomla related. You cannnot control the browser from the webpage.The fact that the browser is filling the information is due to the user's actions of saving his password (Browser asks "Do you want to save password?). Doing this on a public computer is in deed not recommended but if a user chooses to store his information on a public computer, then it's neither your or our problem. This is common to all logins. Even Yahoo's mail login behaves the same. If you login to yahoo and save your information in your browser, every time you visit yahoo's mail the browser will fill in the information for you.

Conclusion:
1) This in not joomla or module related
2) You cannot control user activity or browser from code
3) You cannot _base_ your security on public computers (cpanel webmail advises everyone to LOG OUT every time they leave their computer)
4) You should advise (a small memo on the bottom of the module) your users that saving their passwords is only recommended on PRIVATE computers and they should logout as soon as they have finished writing their work

Thanks. Is the "small memo on the bottom of the module" already in place or it has to added? If it has to be added what and where please.

well I will develop such a new feature in the next version but I must say it is not very "used". Meanwhile you can just add ca Custom module under the webmail login with such a notice. Should do the trick until the new version is out