BuddyPress on Multisite

BuddyPress sits on top of an entire WordPress
installation, regardless of configuration. That means on single-site,
multi-site, or multi-network installations, BuddyPress only has 1 set
of data tables. As a result, you only have 1 set of Groups, Activity,
Private Messages, Profiles, and Friends, even if you have 1 site/1
network, 100 sites/1 network, 100 sites per network/100 networks.

How to save Uploaded image in custom option panel?

I’m trying to add a custom option panel to a new template following a tutorial found on NetTuts. I saved all the code for the option panel inside a file called optionpanel.php (LoL) and everything is working but now I would like to add an Upload/Image button so I’ll be able to change images inside a slideshow straight from WordPress Media Library instead of connecting via FTP each time.

How to implement AJAX post navigation into WordPress?

I am developing a wordpress page template exactly like this.
I have completed the design and have loaded the template once user goes to this page which using my template. I want to all posts in more article list open in this template without refreshing the page. but when i click on any post in the list it opens in a new page which is off course different from my page template. Please guide me how i can open the posts in the “more article” list open in my template.
Here is my code i have till now.