Create and apply fonts via CSS styles that override the default page properties fonts.
Copying and pasting the above sentence preceded with "Adobe" produced the following links doing a search. Just search with the software brand you're using to get more brand directed answers. But you knew all that.
http://help.adobe.com/en_US/dreamweaver/cs/using/WScbb6b82af5544594822510a9...
http://help.adobe.com/en_US/dreamweaver/cs/using/WSE4424F18-82C5-4fea-A020-...
Ken