Menu items – how can i make top level opaque?

I am using HighEnd (it’s fabulous by the way – thank you for creating such a great product),
Issue 1)
I’m trying to make my top level menu’s opaque but not transparent (as they currently are).
Currently I have sliders that sit under my top level menu’s and the text on the menu’s is hard to see. When I hover over them, no problem, but I want the base elements a little less see-through (or even white if opaque is not possible). If you have a look at my website, you’ll see what I mean.
Issue 2) I would like to put a background image behind where my company logo sits (and have the image cover the entire header section where it is currently black). How can I do this? (My logo is transparent and I would like a carbon effect image behind my logo – I have the image already.)
The website is http://www.gcp.asia
Many thanks. Gavin.