[Orgmode] Replace the string in project setting

[Water Lin]

I set publishing project by
------
(require 'org-publish)
(setq org-publish-project-alist
-----

and I also want to embed css sheetstyle by setting
--------
:style "<style>...</style>"
--------

But the style is too long and I want to use a string to replace it.

So I set a string by
-------
(setq waterstyle "<style>....</style>")
-------

and replace the :style like following:
-------
:style waterstyle
-------

But while I publish the project, Emacs prompts an error about this.

I am not very familiar with elisp. Can I embed the style by a string
like this?

Thanks

Water Lin

-- 
Water Lin's notes and pencils: http://en.waterlin.org
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