Colin, L4L7,
A bit more by way of explanation...
I'm looking at extending the LTM Maintenance Page iRule in the code share http://devcentral.f5.com/wiki/default.aspx/iRules/LTMMaintenancePage.html
I have an iRule very similar to the one in the code share in production but when there are no active pool members and the Maintenance Page is invoked the user is redirected to the Maintenance Page URL.
http://www.domain.com/maintenancepage/index.html
What I would like to do in the situation where there are no active pool members is have the Maintenance Page display but the URL in the browser to remain as the URL the user browsed to - thus allowing the user to press F5 to refresh the page or alternatively use the http-equiv="refresh meta tag in the Maintenance Page to refresh the page periodically and in the event a pool member comes online, the true page the user wanted being displayed.
Any clearer? ;-)
fergu5