Need Help with PHP Coding

Need help with PHP coding please, i have search in several forum and googling but not find the answer.

My point is :

PHP connect to MySql database.
The menu have 4 till 6 sub menu level.
the content div only change if the link was clicked.

the procedure is like this
If menu in content A click will change (Content B, Content C, Content D, Content E)
If menu in content B click will change (Content C, Content D, Content E)
If menu in content C click will change (Content D, Content E)
If menu in content D click will change (Content E)

associated with the menu as mentioned on the picture the content change the div only not the whole pages, and perhaps the url address will be like this
(index.php?id=1&Bid=2&Cid=1&Did=5&Eid=3)
the "&XXXid" indicate that the content has been clicked.

Many appreciated for the support and help for my question.

Thanks...