I think there is a bit of confusion here. What exactly do you mean by preferring AJAX to Javascript? Please note that the J in AJAX IS Javascript.

Don't think of AJAX as a 'product' - rather it is a 'technology' - a combination of Javascript with XML.

So I really don't understand what you mean by 'having less errors on AJAX'. But I DO know this. As a first step, it is always best to make your HTML pages XML compliant. And to do this, what I'd advise is to convert all HTML pages to XHTML. Thereafter, you should focus on bringing in the rest - Javascript + XML.

Happy coding.
M.I.Z. Khalid