ok. you wanted a workaround. Not very flexible, but it works for me.
<body>
<div>
<img alt="" src="../Images/nysmap.jpg" />
<p class="tweak">tweak</p>
</div>
<p>body body body body body body body body body body body</p>
with
.tweak {margin-top: -100%;}
in the css.
The map outline image scales to the screen width on my iPod Touch with iOS 4.1 in iBooks and the "body body ..." text overlays on top....