Problem with "page is not cached" : (

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   Hi
i have a problem with the pages that use this section
------------
'Make sure this page is not cached
Response.Expires = -1
Response.ExpiresAbsolute = Now() - 2
Response.AddHeader "pragma","no-cache"
Response.AddHeader "cache-control","private"
Response.CacheControl = "No-Store"
-----------
i am using a DHTML menu for my forum
but when click on the links( in this DHTLH menu ) that linked to the pages that use this section i get the java script error
but when i remove this section my problem solved
and now is there any code that i add to this pages
that it understand when the user is connected to the internet or
when is not ( browser is online or work offline )
and if the user is not connected when the user click on this pages a message appears on the screen that " in order to enter this page you should be connected to the internet"
only i need the code that detect the  browser offline mode or online mode
please help me administrator just 2 line code 
 
Thanks