Thanks the width adjustment worked.
<tr><td width=300 align=center valign=top>
<a href=product.php?productid={$products[product].productid}&cat={$cat}&page={$navigation_page}>{in clude file="product_thumbnail.tpl" productid=$products[product].productid image_x=$config.Appearance.thumbnail_width product=$products[product].product tmbn_url=$products[product].tmbn_url}
{$lng.lbl_see_details}</a>
</td>
My client wanted large thumbs and so adjusting the width in the table tag worked great.
Thanks!
rgbdna