Is a WebService the best solution for this problem?

I have a modal popup in my ASP.NET web appllication that appears after 30 minutes of inactivity.  After a further 10 minutes the user is redirected to the login page (and logged out).  Witin the popup is a button that the user can press that causes a partial page postback, dismisses the popup, then gives them 30 more minutes before appearing again.

The problem is that on large pages, the postback file size is large.  So, I am looking for an ultra-lightweight way to post, say, just a string to the server and retrieve a string, just to keep the user's session active.

It appears that ASMX WebServices, and ScriptMethods/WebMethods provide this mechanism, however:

1. The logic needs to go into a Master Page (as its applicable to every content page in the application)
2. The solution doesn't necessarily require XML
3. The solution shouldn't allow access from external sites/applications, as this only relevant to the current application and serves no purpose externally.
4. The code-behind logic must be accessible (executed) from a button using javascript, without a full postback

Based on the above, can anyone advice on the best method to use?  I will happily award points for all valid contributions.
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RouchieAsked:
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Didier VallyConnect With a Mentor Systems Engineer and Finance AnalystCommented:
I think you can use Webservice (ASP.NET Webservice) or better : ExtJS.
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RouchieAuthor Commented:
Didn't cover much detail...!
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