PHP guestbook - work Standalone but not with LoadMovie Any tips?

Hi I have a php guestbook that works perfect as standalone but not what i load it as external movie

I think that my problem is that , when my guestbook can not read the entry.txt
and that I must do something to load the entry.txt in a higher level

Follow is my code

myData.load("[](" + randNum, myData, "POST");

any tips?