Menukey And Variables In A Query String Menukey and variables in a query string

I am new to php. I was trying to develop a website that has an index page ( main page). If I click on any link, the contents of the new page displays in the center of the main page. If I click on customers link (I do this by assigning a menu key from my index page). I was trying something like this

<a href="'.$this->php_self.'?menukey=9'.'?page=1">'.$tag.'</a>

I think php_self doe not work here. I do not know how to go the root path of the present customers.php page. I need to go to /index.php?menukey=6/customers.php?&page=2 etc.

I have been struggling with this for the last two days. Any help is really appreciated.

The path is /index.php?menukey=9/Customer.php?page=2

Here if select page 2 in list of customers, it displays correct results, but on a new page. I want this to be displayed on the same page where the first page was displayed. Here I am calling cutomers.php based on the menu key selected in index.php. So when I select page 2 of customers also, I want to maintain my css styles. So I would like to go through the menukey=9 and also page=2 of customers.php and display page 2 replacing page 1.

Here is the link for my page http://forums.xisto.com/no_longer_exists/

Please ignore any debugging strings on the page.

Thanks