( taken from http://wordpress.org/support/topic/30273 ) Hi again, Instead of messing around with making dramatic changes to files and making a new Page template file I just add a conditional statement within Header.php 
<body id="<?php echo (is_page()) ? get_query_var('name') : ((is_home()) ? "home" : ((is_single()) ? "single": ((is_category()) ? single_cat_title() : ((is_archive()) ? "archive" : "")))); ?>">
Yes I know its complex because I have used the short-hand method for writing conditions however here’s what it does;
  • If page is a Page grab slug for id
  • Else if page is home just hardcode id “home”
  • Else if page is a Single post just hardcode id “single”
  • Else if page is Category grab category name as id
  • Else if page is Archive just hardcode id “archive”
  • Else dont know what it is so set id as nothing
Assumptions: Only Pages and Categories will have a unique style per page, other pages will just have a generic style for that type of page. Hope this helps ;)
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