I'm not sure what kind of scroll bar you need. The browser itself should display a scroll bar that allows the user to scroll up and down to view the content if it goes beyond the bottom of the page.

If you only want the content to scroll within the page and leave the banner, navigation and footer staying in the same place, you could use a div tag around your content something like this:

<div style="border : solid 2px #000000; background : #ffffff; color : #000000; padding : 4px; width : 400px; height : 200px; overflow : auto; ">
Your content would go here
</div>

Change the various parameters as needed but the key items are width and height.