Well, you could move your Word Press files to a sub-folder under your domain root. For instance, www/ is the root folder with index.htm as the default page, and www/blog is the blog folder with index.php as the main blog page.
Or, if you want to share your styles across the whole site, you could upload Word Press as normal (to the root folder) and change your settings on your wp-admin interface. Click on the “options” tab, and find the 3rd and 4th lines that say “Word Press address (URI):” and “Blog address (URI):”. You can change the Blog address to a sub-folder and keep the Word Press address as the root. That way, your index.php would be a static page, and you would want to set up a link to /blog.php, or whatever you name it. I haven’t tried this, personally, but it should work, in theory. Let me know if it doesn’t.
~Jonathan
