Change scrollpane content to different mc

Hello. I currently have my scrollpane working fine. I have a movieclip dragged onto the stage where my scrollpane is and i use this code:

mcpane.source = aboutcontent;
aboutcontent.x = -50
aboutcontent.y = 20

however, now i would like to put links at the top. When i click on the link, the content of the scrollpane changes to another movie clip.

How can i do this? Do i need to drag all of the movieclips onto the stage?

How do i remove the old content, and then load the new content from a mc into the pane?

Thank so much for any help

regards,

J