Image without proportions

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Hi!
How can I make C5 insert an image without the "width=..." and "height=..." attributes, so the CSS attributes are used by the browser?
In the attachment you can see what happens, when C5 adds the attributes, It's supposed to stay proportional.



UPDATE:
CSS: width=100%;height=auto; makes the browser scale it proportional into the available width. This overrides the HTML attributes C5 adds.

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