How to change image with onmouseover in different place that reverts back to default image on the site?

Question

I\'m no expert in this so excuse me if this is very basic but I couldn\'t find answers.

So I want to have navigation section with categories on the left side of the

Answer 1

An addition to the above it may be easier in the long term to just use one function and pass the element no as a parameter. Along these lines

    
    



          

              
Subcategory One
              
Subcategory 2