I know whats going on here
I had cable internet and I could use my Mac as a web server anytime it was turned on
Now I have Sympatico DSL and it switches IP number quiet quickly, making it impossible to set up a link to your sites from another computer.
You can check your local machine to see if it serving pages by typing this the web browser on your machine
127.0.0.1/~youraccountname/index.html or the name of your page
Im not at home so I cant check this
you may have to experiment
Your firewall may also be a problem, someone else might help with that.