Keep-alive browser event and coding one with JavaScript under Cold Fusion

Using the JavaScript functions imbedded within Cold Fusion, I have several cases where a seperate browser window is called, opened, and presented to the user. The second browser window allows the user to work with whatever functions/applications are part of the new window.

The problem with this approach is that the original or sending browser session does not mainatain an 'active-state' and will therefore time-out based based on the pre-defined variables (based on business and security rules) that are required for logging-off an 'in-active' browser session.

My idea to control this is to somehow create a 'keep-alive' event that will stay in constant communication with the sending browser session and will keep it active so long as the user is working or active within the second browser window. This is necessary because the user's original or 'sending' browser session is password/userID protected. Obviously, if the user is working away in the second window that was called by the Javascript event imbedded within the Cold Fusion page of the 'sending' event, then the original session will time-out, log-off and require the user to log back into a new secure session.

I need and event(s) that can either suspend the time out activity of the first browser session until focus returns OR keep sending back an event that will make the sending browser window 'think' it is still active?