How do I add an image BBCODE?

[hitmann]

I'd like to add a BBCODE that has the exact same function as the [ CODE] [ /CODE] tags, but instead of saying "Code:" at the top, it ads an image that is hosted on my server like this:

https://vborg.vbsupport.ru/external/2007/09/37.gif

Could you explain to me how to achieve this?

Thank you.