There is a way to stop it. it depends on what browser you use as to the method though.
Firefox has an ad blocker, right click over teh image and select block images from .... option
Not sure about IE as I don't use it however there is another option involving the hosts file that works no matter what browser you use.
If you rightclick the image and select copy link location.
Paste it into notepad and note what the domain is (i.e.
http://WWW.ACCRINGTONWEB.COM/forum its teh bit in capitals)
go into c:\Windows\system32\drivers\etc and open the file called "hosts" in notepad. it will look like this
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
On the line that says localhost, add a space at the end and then type the domain that you got from the image, save the file and exit