no - then you will have the same issues in IE.
just do
<img width="200" src="the url" alt="alt text" />
Still not sure I understand 'determined by the image'. If you set the width only, it will scale based on the width. If you want it to scale by the height, set the height, not the width. Anything else will distort the image, unless width and height are set proportional to the original.
see
this to understand what the html settings will do.