How should we help you without knowing the scripts? The only thing i can recommend to you is to check if the scripts are compatible with PHP 5.4. Maybe you can get them to work if you simple hide the messages.
That will not solve the issues, but without knowing the code noone can teach you how to modify it to get fully rid of the messages.
best wishes, Altrea
We don't provide any support via personal channels like PM, email, Skype, TeamViewer!
Thanks for replying. The problem is that the erros affect the website deeply, so hiding them is not a really helpful solution. When uploading the scripts to a webhosting site they work perfectly. In other words this happens only with localhost. :/