Like I said you can write a expression for this.* Not big deal, slowish but works just as long as the the number of curves does not change. Make a illustrator object with create -> adobe illustrator yada yada. Then assuming the ai files have names foobar_1.ai-foobar_23.ai (no padding). Then making then your expression look like this (open expression editor and drop the text there and hit create):
setAttr -type "string" illustratorForBevel1.illustratorFilename ("C:/Temp/aiSequence/foobar_"+frame+".ai");
Check that names are correct for both node names AND file names. Now this is a bit bad expression but string vars cant be set any other way without writing a api node. Anyway you should know at least this much about expression writing. Now this might not be optimal so you might ALSO want to explore loading all ai's in memory and hide the sequentially, thsis a 5-6 line mel for loop**
Beware! illustrator objects can seemingly randomly flip their orientation!
*because he neither asked nor commented its understood that that's enough for the asker, usually its not a good idea to hijack a 4 year old thread by the way. Thing is peoples skill level vary widely.
**if you ever intend to use computers more than 1 hour each day i highly recommend learning to wiirte a simple for loop it will dramatically make your life easier.