How strong of an understanding of Javascript do you need to know in order to learn AJAX?

kadowki

New member
I'm planning on taking a course in this language and am wondering how much I might need to know in order to understand AJAX to the fullest.

I have lots of experience in HTML and CSS, but only a little bit of Java, but no Javascript.

Also, side questions: Is AJAX a good alternative to users who can't do Flash or Actionscript? (Not that they're the same, but they both can make a nice looking website, that's all I'm concerned about.)
 
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