I’m new to forums so ill do this step by step. I have had very bad experience with other forums. Im hoping this one is different 
I have rollovers working on jsfiddle.net/YbapF/3 but what I would like to achieve is when I clicked an image, it shouldn’t be click-able again and neither should the other images until the reset button is clicked. I have a few questions I would like help with so Ill ask them one by one as they get resolved.
Updated Version
At the moment the image is click-able but its changing the image to _none instead of _on. The _none needs to be applied to all the other images if image is clicked.
It also shouldn’t be click-able again and neither should the other images until the reset button is clicked.