Determining Age of Another Web Page

[lajme]

I have a main page on a web site that includes an Iframe with current news headlines. Issue is that the Iframe source page is often stale (Old News).
I want to be able to determine the age of the Iframe source page and if the last modified date is over 30 days old, then I want to hide the Iframe.

Any help would be appreciated.

[MurderSkillz]

http://uptime.netcraft.com/up/graph type in the website address at the top and hit enter it will tell u what its running on and the last modified date. hope i helped

[lajme]

Found my own answer. Insert the following for page update time.
<!--#flastmod file="pagenamehere.html"-->

Key point not explained on many sites is that page containing above must be named with a .shtml prefix so that the server knows to interpret the request.