Best way to design front-back end of intranet?

[dcparham]

What is your opinion on the best structure to use to integrate what people see on the intranet pages, and the "back end"? Also, best method to install a search box? Being inside the network seems to disallow out-of-box packages offered for sites accessible via www. Should each PHP page be built dynamically from a mySQL database back end? Would that assist searching[user search criteria then searches database, all the tables, all fields containing links, content, and other data stored in db records]? Meanwhile I will design what each page should look like [content, layout, images.] But need to determine what set of technologies to use. FLEX? AJAX? is Flash encouraged? Should I just get it built, and worry about Search later? Just get it built, and worry about automating page building later? If I build each page dynamically via database, will/won't it be too slow??

Thank you for your time - eager to hear your wisdom!