As mentioned, you can save the website and click on View then on Source code (Page source on Firefox, something similiar on most browsers), editing this source code will change the contents/layout of the page.
You could also use any web page editing package (Dreamweaver etc) to make changes. This would be easier if changing graphics on the page.
Before you begin (even thinking about) "copying" a web page make sure you are FULLY....
CCOVICH said:
aware of any potential copyright issues that may arise from copying websites.
several site copiers out there, as has been posted, as long as you dont infringe on any copyright images/text etc you'll be ok..
Try this http [broken link removed]
select File\SaveAs\Web Page Complete and you'll have the page (HTML) and a folder of images. You can then import the page and images into your website authoring program. Illegal without permission but great for learning how to create web pages along with looking at the source code