how to show specific value from table column and update column - php

Question

I have built a web page that updates the status to either active, inactive or "NA".
"N/A" = 0
active = 1
inactive = -1
This all works fine
These are therefore inserted into database: 1, 0 and -1
Now i want to make a update page that only shows inactive values, in other words, only shows -1
Now I want to update this like I have inserted it on the insert page
if($_REQUEST['update']=="Yes")
{
if($_GET['status']==-1){
$update = mysql_query("update causelist set msg=0 where id='".$_GET['uid']."'");
}elseif($_GET['status']==1){
$update = mysql_query("update causelist set msg=-1, where id='".$_GET['uid']."'");
}elseif($_GET['status']==0){
$update = mysql_query("update causelist set msg=1 where id='".$_GET['uid']."'");
}
}
?>
<table width="100%" style="table-layout:fixed;">
<tbody>
<?php
$query = mysql_query("select * from causelist where CaseType='A'");
while($res= mysql_fetch_array($query))
{ ?>
<tr >
<td class="blueh" width="5px" style="height:40px;">
<?php echo $res['SNo']; ?>
</td>
<td class="purpleh" width="25px" style="height:40px;">
<font size="3" style="color:black;line-height:100%;font-family:'Calibri';">
<?php echo $res['CaseNo']; ?>
</font>
</td>
<td class="purpleh" width="25px" style=" width=20px;height:40px;">
<font size="3" style="color:black;line-height:100%;font-family:'Calibri';">
<?php echo $res['CouncilName']; ?>
</font>
</td>
<td class= "purpleh" width="25px" style="width=20px;height:40px;">
<font size="3" style="color:black;line-height:100%;font-family:'Calibri';">
<?php echo $res['resadv']; ?>
</font>
</td>
<td class="redh" width="3px" style=";line- height:50%;">
<?php if($res['msg']==1)
{
//echo "Active";
echo "<img src='images/r.png'/>";
}
elseif($res['msg']==-1)
{
//echo "Inactive";
echo "<img src='images/take.png'/>";
}
elseif($res['msg']==0)
{
//echo "NA";
echo "<img src='images/none.png'/>";
} ?></td>
<td class="redh" width="3px" style="center;height:5px;line-height:50%;">
<a href="case.php?uid=<?php echo $res['id']; ?>&update=Yes&status=
<?php echo $res['msg']; ? >">
<img src="images/p2.png"/></a></td>
</tr>
<?php }}?>
</tbody>
</table>