surely something smaller (say 500x400) would be more user friendly (not everyone has 1700pixel wide screens you know.
Its not hard, even with flickr you can do it.
Step 1: select the image you want as sample and clickthe "insert image" tool above and paste in your image.
Step 2: then high-light that text in the edit window and click on the link tool above
to insert the URL (you know, the http:// bit) to a higher res image
or the (for example flickr, but it could be pbase) page which it refers to
its also way more net friendly and makes the pages way easier to load and read.