Hi, I'm experienced with PHP and I'm familiar with JS syntax but still a beginner.

Now I want to learn AJAX And JS and I've looked at jQuery but it doesn't look like JS to me, I mean I'm sure it is but it looks to me like jQuery has a syntax of it's own and I want to learn not just a framework but also the underlying language.

So now my question is; what framework will be the best choice when that is my goal?