Don't let 'AJAX' scare you. It's trivial to do especially with all the examples and tutorials around.
Trivial to do but not so easy to get right although, one has to start somewhere.
Doing AJAX, by itself, is not awesome and unfortunately more often than not, done badly, but AJAX done well, now THAT'S awesome! 😉
You can tell an awesome use of AJAX when you see an application that is AJAX 'enhanced' as opposed to AJAX dependant.
Turn Javscript off and if the application still works, I am impressed, if Javscript has to be on for the core functionality to work, yawn. 😃
My rule of thumb regarding the use of Javascript in general, and I use Javascript a LOT, if the same core functionality isn't available with or without Javscript enabled, one would be best to look for a different solution or consider whether or not one is only adding a buzzer, whistle or bell that will be interesting for all of 2 seconds and one could do well without.
For what it may or may not be worth. 😉