Getting started (background PHP) - a little help needed

Getting started (background PHP) - a little help needed

Hi all. I have been programming PHP for like 10 years - on and off - and I find myself quite comfortable programming this. I have always been keen on learning javascript - I am at the level that if I use some hours I would be able to modify some simple javascripts - and when I learned about AJAX I saw the ligth - and when I found out about Jquery I was like - I gotta do this :)

So I have some basic questions probably - and please correct me if I am wrong!
1) Jquery is a library - and basicly it is javascript in the HTML code sort of right?
2) So if I shall master Jquery and PHP in combination I need to learn javascript right?

So how is the best way to get to learn javascript and some combinations with PHP. having said this as soon as the variables get back to PHP I am on "homefield" - but I have trouble understanding the context in the Jquery/javascript functions - and the communication layer between fron and backend (Jquery/javascript and PHP).

Well as any learner I probably need some good HOWTOs with examples - since it is my experience that this is the best way to learn new stuff - so I hope that someone outthere can give me some links with good places to begin my JQuery/javascript learning proces - and so I can connect PHP together (later perhaps) :)

I am looking forward to hear from some of you experienced guys!