Intranet - Make it refresh on each visit?

Hi all, we have an Intranet, and whenever i update the index page, when it is viewed on a computer, in order to see the changes they need to refresh the page, is there any way i can make it so each time they visit there is no cahed version so it refreshes each time basically.

I have tried adding:

<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">

to the head, but it doesnt seem to be working, any ideas?

Thanks!