I am using jmeter to do some performance testing on my site. I will user ant to drive the jmeter tests.
Now the problem is I need to automate this process so I can run the test on a regular interval however the user does not have to be logged into the computer.
It seems that you are looking for a continuous integration system.
There are several available and on of the most popular of those is Jenkins
Those systems let you build/test/whatever you project whenever code is changed or a build is scheduled.