Respected Sir,
I have set of web pages link in the database. I downloaded web pages
(including content & images) using httrack under "foldername_datetime"
directory. 

When I execute the script again, I would link to download the web page into a
separate folder only if the content has changed.

I don't know how to verify, web pages has modified or not. Please help me on
this.

Regards
Anandhi