Changing the content of a template

Hi everyone I created a small dashboard I inserted an image on a group using the ned dashboard template

<img src="/fan r.png" align="middle" style="width: 485px;
                           max-height: 100%;
                           max-width: 100%;

the images in question is a fan it must be displayed in green if it is on and in red it is off How to change images on the template according to my needs

There was a thread only today which shows one possible approach

Thanks for your help

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