php and filesize

On the attached page, the following scripts wotk fine with a static image:
--------------------------
<?php
echo filesize("downloads/picture3hr.jpg");
echo "&nbsp;&nbsp;File Size in Bytes";
?><br />

<?php

$f = "downloads/picture3hr.jpg";
$size = filesize($f) * .000001;
echo $f . " is " . $size . " Mega bytes.";
?>
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The above scripts were used just to test the page
I am trying to get the file size from the following code being fed from a mysql recordset:
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  <?php do {
            
        ?>
        <img src="<?php echo $row_imgs[im_thumb]; ?>" border="0" /><a href="download.php?file=<?php echo $row_imgs[im_hres]; ?>">D</a>
        <?php } while ($row_imgs = mysql_fetch_assoc($imgs)); ?>
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Can someone please point me in the direction of how to add the filesize function to this loop so that it returns to file size for all returned records
index.php