Hi Edgar,

You could do your Graphs and/or Charts as a SVG file. They are XML Vector based so scale really well.

Abstract from the W3C

Scalable Vector Graphics (SVG) offers a number of features to make graphics on the Web more accessible than is currently possible, to a wider group of users. Users who benefit include users with low vision, color blind or blind users, and users of assistive technologies. A number of these SVG features can also increase usability of content for many users without disabilities, such as users of personal digital assistants, mobile phones or other non-traditional Web access devices.

The only down fall is that you need a plugin to view the SVG file in the browser.

Adobe has a good plugin you can dowload for free.
http://www.adobe.com/svg/viewer/install/main.html

Adobe also has samples/code of SVG files.
http://www.adobe.com/svg/demos/samples.html

There are some guide lines and tutorials/samples from the W3C
http://www.w3.org/TR/SVG-access/

I'm sorry but I haven't used the Office Component so I can't say that I know much about it.

Hopes this helps.

Kind Regards,
Tarran Walker