functions.php / replacing div’s with new ones?

I would definitely suggest you rewritting your theme.

Correct me if I am wrong, but WordPress themes are created so that you can manipulate with them. (if you want)

Another thing to take into consideration is, assuming from your filename headerstyle3, you probably have a theme containing more of such pages, varying in numeric index (headerstyle1, headerstyle2), with a different design, so remember to deal with them also.

Please, bear in mind, that I can not tell you, how to replace your code. In order to do that, you need to provide us with a little bit more info, (like whether you want us to help you replace it), i.e. the whole source of your desired menu, your current file content of the file headerstyle3…

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)