There are multiple options, depending on exactly how you want different size images responding to different size browsers. The first idea that came to my mind would be to set the maximum width of images to a fraction of the screen width, so no images ever display wider than say 50 percent of the screen.
To do this, start by adding the "imgResize" class to each image, like this:
<img class="imgResize" src="[%GraphicsPath()%]CompanyLogo.jpg" border="0">
Then use this script:
var screenWidth = SSI_ScreenWidth();
$('.imgResize').css('max-width', (screenWidth * .50) + 'px');
The ".50" can be updated to change what percentage of the screen width you want images filling up.
Is this solution acceptable for your situation?