Cancelling Long Database Query

I don't excactly know whether this is an ASP, webserver or SQL-Server problem:

I have an ASP with a search form. By clicking the submit button it redirects to my result.asp page which initiates a database query that takes pretty long (up to 4 minutes).

Now if I push the cancel button in my browser because it takes too long and want to open another ASP page in that browser window I just get the "page loading" bar until, it seems, the query I initiated before has finished, and then shows up the wished page.

What I think is, that the webserver is waiting for the the command:

set rs = db.Execute(sql_search_string)

to be finished by the SQL-server and does'nt respond to other page requests (but only in the same browser window) until the recordset is filled with the information from the SQL-server. Code: