Multiple URL’s With 1 Web Hosting Account

I am trying to determine the best design approach for this business need.

There are multiple URLs:

[url]
[url]
[url]

The URLs are going to be specific to a topic but the displaying of the pages is template based. For example, there is 1 JSP page that will display the content for a topic based on an ID.

[url]is ID 1 in my database table.
[url]is ID 2 in my database table.
[url]is ID 3 in my database table.

So I could do a form post to display the specific content for a topic.

Code:
<form name="frmTopic" action=”/topic” method="Post">
<input type="hidden" name="topicID" id="topicID" value="">
</form>
So by populating the topicID and posting this form, it directs to my JSP page and displays the content specific to the topic ID. So if I pass 1, content about cats is displayed. If I pass 2, dogs and 3, birds.

I want to keep the URLs specific to the topic but I do not want to pay for hosting for each site since the only difference from one site to another is 1 page. The 1 page is the page that tells the JSP page which topic to display (I realize I have to hard code the ID number after I add the topic to the database).

Here is my question.

Is there a way I can have a specific index.htm page for each site [url]with one hosting account (I am using GoDaddy)? Then I could have this page redirect to the template JSP passing the ID. I could then put very specific items about the topic on this page to hopefully improve its page rank in search engines.

If this is not possible, I could create an initial JSP page that checks the ServerVariable for the specific URL and then passes the ID… something like this:

Request.ServerVariables("SERVER_NAME")

I am looking for feedback on the best approach so if there is an option that I have not listed that is better, please let me know.