You’ve gone from Photoshop PSD to slices to XHTML using Parts 1, 2, and 3 but if the end result is a Wordpress theme the majority of the work still has to be done. First of all it’s important to understand one bit of the operational mechanics of Wordpress. Wordpress looks for certain information the header of a file called style.css, this is how it can tell themes apart. Here’s a better explanation from Codex:
In addition to CSS style information for your theme, the stylesheet, style.css must provide details about the Theme in the form of comments. No two Themes are allowed to have the same details listed in their comment headers, as this will lead to problems in the Theme selection dialog. If you make your own Theme by copying an existing one, make sure you change this information first.
Thus, we need to separate our inline CSS and put it in a separate file called style.css
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