Opacity of a color
 

I would like to make the color of the menu bars slightly opaque. Is there a way to add that type code? I know how to add it (I think). I just do not know what the format of the code for opacity would be. Any help?

If you are trying to change the color of an element that is controlled by css then change the color called out for that class in the css file.
If you are trying to change the color in a graphic then edit the graphic in an application such as Photoshop and upload the modified version to the server.

There is no way to change the opacity per say, but you can alter the color to make it appear more opaque.