Krishna – YOU can check any base64 code you find yourself before posting on the forums that it’s “malicous”. It is used regularly to hide malicous code but it DOES server other purposes, such as in her case where its being used to compress images to make the site load faster.
I don’t recommend it being used, but some developers like to hide their code, which is fine, but don’t automatically scream malcious code. Check it out yourself first, there are plenty of tools to do that and you can do it yourself with php if you know what your doing. Most of these people don’t even understand what you are saying so all you do is cause confusion and panic.
She was having a problem locating where to set-up her menu, not any issues with security, viruses or malware.