This strikes me as a very clunky design in any case. However, maybe it's outside of your control so you need a solution. Rather than trying to edit the guts of the HTML (the exact content of which may change at some point presumably), I'd be tempted to do it simply by setting the image dimensions in CSS. If you can be sure that the ONLY images within a table cell are the ones referred to, you can just include
td img {width:200px !important; height:200px !important;}
in your existing stylesheet. If not, the simplest thing is to add a classname to the
<table>
tag (just replace
<table
with
<table class='img200'
) and add
table.img200 td img {width:200px !important; height:200px !important;}
to your stylesheet.