ผมต้องการให้เปลี่ยนรูปตามสถานะที่กำหนด จะเขียนเงื่อนไขยังไงครับ

<?php
function displayImage($filepart)
{
	$objConnect = mysql_connect("localhost","root","12345678") or die("Error Connect to Database");
	$objDB = mysql_select_db("project");
	$stt = "SELECT sta_repair FROM tb_com";
	$q = mysql_query($stt) or die ("Error Query [".$stt."]");
	
$filename = "image/wi.png".$filepart; //กำหนดที่อยู่ไฟล์

 if (file_exists($filename)) { //เช็คว่ามีไฟล์อยู่หรือไม่
 echo $filename; //แสดงผล
 }
 
 else{
 echo 'image/true.png'; 
 }
}

?>

<?php
	$objConnect = mysql_connect("localhost","root","12345678") or die("Error Connect to Database");
	$objDB = mysql_select_db("project");
	$strSQL = "SELECT * FROM tb_model where id_room ='4705' order by id_room asc ";
	$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");

?>

<table width="340" border="1">
<tr>
<th><div align="center">แถว</div></th>
<th><div align="center">c1</div></th>
<th><div align="center">c2</div></th>
<th><div align="center">c3</div></th>
<th><div align="center">c4</div></th>
<th><div align="center">c5</div></th>
<th><div align="center">c6</div></th>
<th><div align="center">c7</div></th>
<th><div align="center">c8</div></th>
<th><div align="center">c9</div></th>
<th><div align="center">c10</div></th>
<th><div align="center">c11</div></th>
<th><div align="center">c12</div></th>
<th><div align="center">c13</div></th>

</tr>
<?php
	while($objResult = mysql_fetch_array($objQuery))
	{
?>
<tr>
<td><center><?=$objResult["id_image"];?></center></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c1"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c1"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c2"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c2"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c3"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c3"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c4"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c4"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c5"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c5"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c6"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c6"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c7"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c7"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c8"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c8"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c9"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c9"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c10"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c10"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c11"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c11"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c12"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c12"]); ?>"></center></a></td>
<td><center><a class="a_list" data-myname="<?php echo $objResult["c13"] ?>" onClick="tt($)"><img src="<?php displayImage($objResult["c13"]); ?>"></center></a></td>



</tr>
<?php
	}
?>
</table>
<?php
mysql_close($objConnect);
?>