Use relative links in your VSF projects.

When linking from one page to another or when inserting an image into a page, a URL (Uniform Resource Locator) is used to provide the location of the page or image file. URL's can be Absolute or Relative.

If the page or image is outside the website then the absolute URL must be given.
For example, if your website is located at http://www.virtualsciencefair.org/2006/brown/ and you want to link to a page on another site such as the cbc website, then an absolute link must be used. It will be of the form:
http://www.cbc.ca/science/fish.htm
Note absolute link includes (1) the protocol http (2 ) the host name www.cbc.ca and (3) the exact path to the file /science/fish.htm
You could use absolute links (URL's) for the links to page files and image files within in your website, but please use only relative links.
One reason relative links are better is that if you change the host of your project from www.virtualsciencefair.org to some other host, the absolute links would not work.
(This is why parts of projects from previous years do not work properly. We changed our host from www.alumni.ca to www.virtualsciencefair.org and consequently the absolute links do not work.)

The only occasion when absolute links will be needed in your VSF Projects is when you link to the VSF website and when you link to other VSF projects. These are the only external links allowed in projects.

Relative links simply show the path to the linked file from the current file. For example, since my image file at the top of this page is in the same folder as the page file, the link to the image file is simply links.gif (the name of the image file) .
If the image file happened to be in the images folder on the same level as the page file, then the link to the image would be /images/links.gif

Most website authoring software use the relative link when you insert images and link to other pages.