I need to export absoluted Image url in html in emacs org-mode file:

when i write the following code:

[[file:/images/a.jgp]]

export of html code is :

<img src="file:///images/a.jpg" >

but which i need is :

<img src="/images/a.jgp">

so how can i export what i wanted , instead of use #+BEGIN_HTML tag ?

ps: my emacs config:

 16 ;; org-mode project define
 17 (setq org-publish-project-alist
 18       '(
 19         ("org-blog-content"
 20          ;; Path to your org files.
 21          :base-directory "~/ChinaXing.org/org/"
 22          :base-extension "org"
 23 
 24          ;; Path to your jekyll project.
 25          :publishing-directory "~/ChinaXing.org/jekyll/"
 26          :recursive t
 27          :publishing-function org-publish-org-to-html
 28          :headline-levels 4
 29          :html-extension "html"
 30          :table-of-contents t
 31          :body-only t ;; Only export section between <body></body>
 32          )
 33 
 34         ("org-blog-static"
 35          :base-directory "~/ChinaXing.org/org/"
 36          :base-extension "css\\|js\\|png\\|jpg\\|gif\\|pdf\\|mp3\\|ogg\\|swf\\|php\\|svg"
 37          :publishing-directory "~/ChinaXing.org/jekyll/"
 38          :recursive t
 39          :publishing-function org-publish-attachment)
 40         ("blog" :components ("org-blog-content" "org-blog-static"))
 41         ))
emacs elisp org-mode
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