How to stop a build to trigger???

Hi,

Is there a way to stop a build trigger when the current build is in progress.

Currently a build gets trigger if there is a  check in into the Source control. So when the build is in progress if there is another check in into the Source control another build gets triggered, when the current one is in progress. Is there any other option to stop the second build trigger when the current one is in progress. I know we have an option for schedule, but i don't want to use it.

Thanks