Your JavaScript navigation links on the main page work in IE and Opera, but don't work in Firefox or Safari.

Try posting at the Web Development / Standards Evangelism forum at MozillaZine. The helpers over there are more knowledgeable about web page development issues with Firefox.
http://forums.mozillazine.org/viewforum.php?f=25
You'll need to register and login to be able to post in that forum.

You have missing closing '>' for those A elements:

<A HREF="page4.html"</A><FONT face="Arial"><H5>Welcome</H5>

Should be:

<A HREF="page4.html"><FONT face="Arial"><H5>Welcome</H5></A>

Also here is a missing '>':

<IMG  WIDTH=270 HEIGHT=250 BORDER=0 SRC="pooley2a.jpg"

You can see that corrupted code as red (A) elements via the right-click context menu of each of the three frames: This Frame > View Frame Source

I still cannot see my links ,as links, in firefox I have made the changes to the link codes as suggested in your last asnswer to me but none of the links work; other that the ones to other internet sites.

I'm still seeing red code if I inspect the page source of the three frames, so if you uploaded the corrected versions of those files to the server then something went wrong and you may need to try again of contact the company that host your website and ask them for advice.

(noticed that the third frame http://www.northfleetlions.co.uk/page13.html has an unclosed <div -> <div> )