Auto hide and expand categories module in Opencart website

Hello, I have a website and 1st position of left side has a special built categories module. I want to make it expandable if visitor is at a page except home page. So It must be visible as expanded only at home page but it must invisible at other pages. When you mouse over the header of the categories module, it must expand and show the module. For a demo you can visit [login to view URL] Everything is ready and I only need you to write the code which show and hide the module. My budget is not too much and I will try to choose lowest budget. Thanks.