Product thumbnails are setup in the file located at:
[cartlocation]/includes/display/ProductDetails.php
To edit the HTML for the thumbnail image, search for the line:
$GLOBALS['ThumbImage'] = sprintf('<a
href="#" onclick="'.$GLOBALS['ImagePopupJavascript'].'"><img
src="%s" alt="" /></a>',
$GLOBALS['ShopPath']."/".GetConfig('ImageDirectory')."/".$thumb);
and change it to something like:
$GLOBALS['ThumbImage'] = sprintf('<a
href="#" onclick="'.$GLOBALS['ImagePopupJavascript'].'"><img
src="%s" width="160px" height="140px" alt="" /></a>',
$GLOBALS['ShopPath']."/".GetConfig('ImageDirectory')."/".$thumb);
This would give you a thumbnail that is 160px wide by 140px high.

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