I've recently been given the task of designing the website for a local non-profit organization. The founder told me he thinks the http://www.ymca.net website is the perfect design to emulate. I think the Graphene theme is perfect for making a similarly designed website, except that the man in charge wants to take the squared look of Graphene and give it the rounded look of YMCA.net, as well as the gradient colors changing on mouseover and while active. I don't think the drop-down menus on that page are quite necessary, but the overall look and feel of the navigation is what I'm going for. Also, I would like to keep the navigation bar beneath the header image on my site, NOT on top like the YMCA.net site, so I won't need to worry about making the navigation bar change places, just appearance.
Can I accomplish this by editing the sprite_h.png file, or should I hard code it in with an image map or something like that? If so, which files would I edit to accomplish this? I'm not a very advanced PHP programmer, but if I have to edit specific code, I'm capable. Any ideas or suggestions?