Well your going to need a server and a ftp program.
astuteftp is decent enough,

prohosting.com and other sites give you like 50mb of free web space,

so open an account with some 1 like that,
they will give you an adress and a password.

use astuteftp to connect to the server,

upload your pictures to there 1st,

then come back here and do

[ IMG ]http://Your.Server.name.com/yourimage.jpg [ /IMG ]

No spaces.

heres a working example.

[ IMG ]http://freespace.virgin.net/shambles.instalations/shamsig.jpg[ /IMG ]
and heres what it looks like no spaces.