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Line A
This line of code does not have a resizer applied to it:

<div align="center"><img src='$images_path/cat_images/$cx[cat_image]'></div>
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Line B
This line of code DOES have a resizer applied to it:

<img style='margin-right: 8px;' src="$images_path/author_pics/$rand_art[aut_image]" border=0 align="left" $rand_art[maxImageSize]>
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Task:

Apply resizer properly to line A


I'm just guessing this is what you want.
<div align="center"><img src='$images_path/cat_images/$cx[cat_image]' $rand_art[maxImageSize]></div>