I am new to DNN and skinning, and in my first experience working with tweaking a skin, I made changes to the html & CSS of a skin... using only left and right panes.  I also had tried to delete some of the earlier, test skins that I had developed. After I uploaded the new skin (whilst logged in as host) the drop down menu items for admin and host appear, but none of the pages come up.  I suspect the content of these pages is all in the content pane, which I ignorantly removed from the html, hence nothing appears in those pages.

Since I would like to revert to the DNN-Blue default skin, but can't get to the menu to do so, I'm wondering:
 (1) how I might be able to do this easily without the page interface, and
 (2) can I somehow affect the parent's skin via the child?

When I try to login to the child sites, i receive the message:

A critical error has occurred.
Object reference not set to an instance of an object.

Thanks!

Thanks for your help. I've uploaded a modified/corrected skin that now includes the content pane, and I'm at least able to view all the pages properly. I am, however, still getting the same error message whenever I try to login to the portal, or any children sites. I've even added a blank line to the end of my web.config file to hopefully reset the app, but I still get the same login error message.

A critical error has occurred.
Object reference not set to an instance of an object.

Any other suggestions? Thanks for your help.