image leeching

I'm trying to find out how to block one particuliar site from leeching my images.
I want an alternative image to be displayed instead.
I know I can use the option in cpanel or just block everything except my site.
But I don't want this, does anyone know what the code in the .htaccess file would be to just block and redirect images to one particuliar site,

thanks
Peter

 

 

 

 

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