getting variable from while loop - php

Question

Okay, I think what I've got is pretty simple for an experienced web dev person. Right now, this this is the index page for State of Debate, my debate website. From the code below, you can see that I have a while loop to echo out each debate, which corresponds to a "did" in the mySQL database. What I need to do, for upvote/downvote purposes, is to get each "did" that goes through the loop. I would then pass it to the "upvote.php" and "downvote.php".
I've tried a foreach loop, although that could be the answer and I just didn't find it. I've used $_SESSION['did'] = $row['did'] and all that does is pass the last did to the PHP page.
Any help is appreciated. And please ask if you need more info.
<?php
$result = mysql_query("SELECT did,debatetitle FROM debates");
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td><a href='/debatepage.php?did=" . $row['did'] . " '>" . $row['debatetitle'] . "</a></td>";
?>
<tr><td>
<a href="upvote.php" onClick="alert('You have given this item a thumbs up! You can change your vote, or leave it how it is.')"; onMouseOver="return changImage()" onMouseOut= "return changImageBack()" ><img
name="jsbutton2" src="Graphics/thumbs-up-unclicked.jpeg" width="75" height="75" border="0"
alt="javascript button"></a>
<script type="text/javascript">
function changImage()
{
document.images["jsbutton2"].src= "Graphics/thumbs-up.jpeg";
return true;
}
function changImageBack()
{
document.images["jsbutton2"].src = "Graphics/thumbs-up-unclicked.jpeg";
return true;
}
</script>
<a href="downvote.php" onClick="alert('You have given this item a thumbs down! You can change your vote, or leave it how it is.')"; onMouseOver="return changeImage()" onMouseOut= "return changeImageBack()" ><img
name="jsbutton1" src="Graphics/thumbs-down-unclicked.jpeg" width="75" height="75" border="0"
alt="javascript button"></a>
<script type="text/javascript">
function changeImage()
{
document.images["jsbutton1"].src= "Graphics/thumbs-down.jpeg";
return true;
}
function changeImageBack()
{
document.images["jsbutton1"].src = "Graphics/thumbs-down-unclicked.jpeg";
return true;
}
</script>
</tr></td>
<?php
echo "</tr>";
}
echo "</table>";

Answer 1

change this:
<a href="upvote.php" onCli....
to
<a href="upvote.php?did<?PHP echo $row['did']"; ?> onCli
and the same with downvote link.
To use the variable in upvote.php:
<?PHP
echo $_GET['did'];
?>