I think this is specific to the way the HTMLB is rendered. So if you want to change it you have to write your own renderer to convert the HTMLB into a HTML document that is correctly interpreted by the browser.
But maybe there is an option for the existing Renderer Object I don't know.
There isn't a way in css to force IE to print the background colours, and you can't change the option for the client.
However, if you really want it you could use an activex component http://www.meadroid.com/sx_intro.asp for the printing (and this will allow you to include background colours). But then of course the users would have to accept the activex component.
Btw I haven't tried the component but its documentation indicates that it can do what you need.
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