I have a blog on a force.com site. The content is read from a custom object that has rich text fields (yes, we rolled our own CMS and run through salesforce approval processes...it's a long story!)
When I put images in these fields, the url for them ends up looking something like this: http://www.mytruecost.com/servlet/rtaImage?eid=a0U30000008KTl4&feoid=00N30000008ck1W&refid=0EM30000000UE2I
What do those parameters refer to? eid seems to be the custom object that housing the content. feid is the field id. I found those by cutting and pasting the ids into my salesfore url.
But refid gives me an "insufficient priveleges" message. What is it?