Creating number of table cells based on variable - php

Question

I am trying to display some images and radio buttons in a two-column table format.
It should start a new row after every two images, instead, the row is ended even though the counter is less than 2 ($i == $c)
I am getting:
<td align="center" bgcolor=#CCCCCC>
<img src=http://web.com/7534560_2.jpg width='200' height='125' />
<br>Primary Image<input type="radio" name="primary" id="primary"
value=http://web.com/7534560_2.jpg />
**</td></tr>**
<td align="center" bgcolor=#CCCCCC>
<img src=http://web.com/7534560_3.jpg width='200' height='125' />
<br>Primary Image<input type="radio" name="primary" id="primary"
value=http://web.com/7534560_3.jpg />
Instead of the expected:
<td align="center" bgcolor=#CCCCCC>
<img src=http://web.com/7534560_2.jpg width='200' height='125' />
<br>Primary Image<input type="radio" name="primary" id="primary"
value=http://web.com/7534560_2.jpg />
**</td>**
<td align="center" bgcolor=#CCCCCC>
<img src=http://web.com/7534560_3.jpg width='200' height='125' />
<br>Primary Image<input type="radio" name="primary" id="primary"
value=http://web.com/7534560_3.jpg />
Here is the code:
<?php
$iq = 2; // first image index offset
$c = '2'; // number of cells in a row
$i = 0; // counter
while ($image_qty + 1 > $iq) {
if ($i==0) {
echo '<tr>';
}
echo '<td align="center" bgcolor=#CCCCCC>';
$image_url = substr($image_url, 0, -4);
$image_url = $image_url . "_$iq" . ".jpg";
echo "<img src=$image_url width='200' height='125' /><br>";
echo 'Primary Image<input type="radio" name="primary" id="primary" value=' . $image_url .' />';
echo '</td>';
$image_url = $image_url_org; // reset image value
$iq++; // increment image number
$i++; // increment cell counter
if ($i == $c) // if number of cells at 2 end row
{
echo '</tr>';
$i = 0;
}
if ($i > 0 ) // if cells remaining less than 2
{
echo '</tr>';
}
}
?>