Don't mix up CSS and javascript.
You put your style in a css file, eg
HTML Code:
body {
margin-top:0;
margin-left:0;
}
You add the other styles you are going to use into this file.
As to javascripts, you can put them all into the external file, but you will still need to call them in the appropriate place in your HTML.
A way to ensure that you keep a consistent page look is to create a template document, ie a page that has all the basics in it - header/footer scripts, etc, and use that as the starting point for all of your pages.
Hope this helps
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