Library Problem

The menu worked fine but i tried to to the upper menu
where there is contact us / about us / newletter and in some site it gave
problems.
The cursur turned into a hand but the link did not work.
This only happened in some site only while the other gave no problems.
Does the library method employs more loading time?

These are the links which gave me no porblems:
http://www.rcgozo.org/ambulanceservice.htm
http://www.rcgozo.org/casualtymoulage.htm

but these gave me problems and i chose to do a temoprary indipendent layer
http://www.rcgozo.org/srilanka.htm
http://www.rcgozo.org/socialeventsvol.htm
http://www.rcgozo.org/underwatercleanup2005.htm

thanks for any help