I am saving a large group of pages from generated URLs for a client. Basically
the urls take the form:

<http://www.site.com/store?123456>

Valid store ID numbers are 100000 to 999999

If the store exists the page HTML will contain the tag <H3>. If the store ID
is invalid, it won't. Because users have been adding and removing their store
listings directly, we don't have a way of generating a valid ID list
beforehand.

I already have HTTrack working with my generated URL list. Can I add a switch
or setting to have it look at the page and check for the <H3> tag prior to
saving it to the directory?