Kinds of links:
•http:// (Hypertext
Transfer Protocol: link to another website on the net)
•ftp:// (File Transfer Protocol: uploading and downloading files to and
fromt the web)
•mailto: (email address launcher)
•gopher:// (Gopher hypertext index)
•shttp:// (Secure Hypertext Transfer Protocol: used by secure commerce servers
•news: (Network news group)
•telnet: (remote access to a telnet server, good for seeing info on web sites)
•wais:// (Wide Area Internet Search)
•none of these prefixes: your pointing to a local page on your site.