Adobe Form : detect page break using java script

Hi,

How can we detect a page break at a runtime using java script? I need to display a data in internal table at header and unique for a document number. i've 10 order list which has multiple items, each of the orders are printed in a new page and i wanted to know this event using a java script which could help me to add some additional logic at header.....pls can someone help on this?