New domain name, same web storage
 

So, I already have one .com domain name and I'm reasonably satisfied with its price, service, yadda yadda. However, I'm thinking of registering another domain name while using the same web space. I don't use very much web space or bandwidth at all, so it seems like a waste for me to get a new web hotel along with a new domain name. However, my present server doesn't allow multiple domains on the same space. Is there any way I can get a new domain, replete with its own file addresses and such, while using the old web server? That is, I'd like to register newdomainname.com and have all the files, like newdomainname.com/seth.html all read like that while they're all downloaded from olddomainname.com/scrotum.html or something.

In short, the quandary is that I'd like to use my largely neglected philosophy website to host a personal website, without real spill-over between the two. I know that there are a billion redirect services, I'd just like to have input on what best to do.

domains are as cheap as $9/year (godaddy) and hosting can be as cheap as $3/month (ifroggy) if you don't use a lot of space or bandwidth [having a lot of data transferred].

I'd just assign a separate host for each site you do - redirects never work the way you'd like them to.