non-secure items in Sharepoint 2007

Answer 1

The problem is that the urls in the links and image src are absolute rather than relative.

http://subdomain.domain.com/someimage.gif is always going to use http as its an absolute link.

/someimage.gif is a relative link (the leading / means relative from the hostname) so if this url is from a http site it will use http, from a https site will use https (well technically depends upon the document BASE but you can ignore that for your purposes)

E.g. given the relative URL /somepage/someimage.gif

When accessed from this page   => Will mean this
------------------------------------------------
http://domain.com/somepage/    => http://domain.com/somepage/someimage.gif
httpS://domain.com/somepage/   => httpS://domain.com/somepage/someimage.gif
http://NEWDOMAIN.com/somepage/ => http://NEWDOMAIN.com/somepage/someimage.gif

and everything will work just fine with no warnings.

The built in CEWP puts all links in as Absolute. To fix -

MSDN - Fixing absolute URLs for all Alternate Access Mappings (AAM) of Content Editor Web Part with a Control Adapter