DOS attack - Please help!!!

My main reseller site is Bandwidth Limit Exceeded due to DOS attack on my site.

I check stats in Cpanel and I this:

# Hits User Agent

1 600241 95.60% Wget/1.8.2 DOS attack - Please help!!!

The main file targeted is /img/home.gif

Please help me to prevent this DOS attack. DOS attack - Please help!!!

 

 

 

 

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