js slide menu

Ok, I´m using a js slide menu to show pendant messages...
I´m loading a server side include inside a div within this slide menu in order to update the messages status and number.

So my question now is:
How can I access the slide menu from my ajax inserted page in order to update the number of pendant messages shown on js menu?
I tried opener and parent but couldn´t reach it so far..

so how can I possibly do reference to an input value for instance, on my ajax loaded page from my parent?