problem in retreiving new record through ajax

[Mr.47]

i have a page on which there is text totally database driven. i have made a backend from where one can can retrieve,update and delete any text(out of 5 i had named toptext,middletext etc). and all this is through ajax. now i am working on insertion and the problem is that when i insert a new record the id is incremented in the database,now in the onclick function id is passing for only the five text already in database so what should i do for the new id like 6 for centertext or anything you enter. how can i retrieve that in the same page?
can somebody guide me?