Need help with counting data and echo after (multiple column)

[pneudralics]

I'm trying to learn how to display data results in multiple column. Can't seem to get php to echo <tr> and </tr> after counting certain amount of data.

 

//Retrieve gallery info
$galleryselect = "SELECT * FROM gallery ORDER BY id ASC";
//Count results
$count_gallery_result = mysql_query($galleryselect);
//Get counted results
$count_gallery = mysql_num_rows($count_gallery_result); 

if ($galleryresult = mysql_query ($galleryselect)) {
while ($row = mysql_fetch_array ($galleryresult)) {
$gallery = $row['image'];
?>
<?php
if ($count_gallery == 3) {
echo '<tr>';
}

echo "<td>$gallery</td>";

if ($count_gallery == 0) {
echo '</tr>';