Is AJAX pretty tough to learn with minimal PHP experience or should I venture into PHP before I move to AJAX? Any suggestions?

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I have a fair amount of Knowledge where Php is concerned. Will AjaX be difficult for me?..
Can Sumone Plz explain AJAX in a nutshell.. and what is does.
Cheers

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Basically, AJAX is javascript.
Try to get comfy with javascript (which can cause dizziness), and then move along to AJAX.

General programming culture seems more valuable to me than simple PHP knowledge.
PHP is an "easy" and fast learning language.
Javascript can be really tricky, and the differences betweens browser drive you nuts.
You will regret the good old "server side" language.

Really, start with javascript.
Be acustomed with the object model, and the prototyping (I don't speak about the prototype js library !) of the language, and then go further to Ajax.
There are just too many differences between JS and PHP to say that a good PHP dev will be a good JS dev. Only experience will.