I'm being attacked

1

hi,

i need some help. i’m being attacked by a bot or something. my daily visits are going up exponentially. here are image captures from my awstats. the first one is where the problem lies. how can i fix this?

[color=#22229c]http://www.pinchpile.com/s1.gif[/color]
[color=#22229c]http://www.pinchpile.com/s2.gif[/color]
[color=#22229c]http://www.pinchpile.com/s3.gif[/color]
[color=#22229c]http://www.pinchpile.com/s4.gif[/color]

thanks