Intranet Search Engine Need help in making one

Hmm.. I am assigned a work of doing a project in PHP to build a intranet search engine. Can any body help?

What should it search?Into html page, mysql database, msaccess database?

I was actually thinking about making a search engine hehe , if you need a hand in anything i could likely give you a hand

See the purpose is to make a search engine like google.com or ask.com which searches the contents in a web server. Say In LAN you are maintaining a site for student management. Now I am assigned to make a serch engine for it.I have said about PHP but any one can share the idea of it.Hope I made myself clear.please help me to get started!

I understand , so really are your looking to do is create a database and have a script that is able to search/add to it . That should not be too hard , Database management i can do