Back button in IE4

Help!

I am currently working on a site which seems to have a problem with the back button on the IE4 browser.

When you go the second page in the site, from the home page (there is a definate order to the site, so you can only really go 1 way through it), and then hit the back button on the browser, it doesn't go back to the homepage, but to the page you were on previous to the home page! Its like the home page is not being stored in the history object of the browser. Annoyingly this doesn't happen every time either, and only happens in IE4. It seems to happen more often than not the first time you access the site after turning on your PC....

Any ideas?

thanks,
Matt.