Javascript is just good old javascript, AJAX is:
Quote:
Ajax isn't anything new, nor are the technologies behind the name, but they've found a new lease of life on trendy new sites. So what is Ajax exactly? Put very simply, it's a combination of XHTML, CSS and most importantly JavaScript and XMLHttpRequest that allows you to update your web page content without refreshing the page.
Of course, this is an over-simplified example and the funtionality of the Ajax technologies has a far wider scope.
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And I belive that its Client side. (maybe wrong)
I found that and i thought it answered your question
