[O] how to produce right link for jekyll

[Dillon Peng]

hi, all
   I Using org to Blog with Jekyll.
   I want to get a right link to link to blog server's relative path after 
publishing, the following is corressponding setting and source:
1. .emacs snippet
  ("org-static-dillon"
          :base-directory "/study/doctor/note/org"
          :base-extension 
"css\\|js\\|png\\|jpg\\|gif\\|pdf\\|mp3\\|ogg\\|swf\\|php"
          :publishing-directory "/study/doctor/note/myblog-jekyll/pdf"
          :recursive t
          :publishing-function org-publish-attachment)
 
2. org code snippet
[[pdf/sigmod05.demo.pdf][xxxx]]
 
I found xxxx's link path was <a href="file:///pdf/sigmod05.demo.pdf">xxxx</a>, 
but I hope it produce a path such as 
"http://localhost:4000/pdf/sigmod05.demo.pdf";.

I know i must miss something,  plsease any one help me, thanks in advance!

BEST REGARDS
Dillon