รบกวนผู้รู้ครับการทำแก้ไขข้อมูลลงฐานข้อมูลครับ ทำแล้วไม่สามารถ update ลงฐานข้อมูลได้

<form action="saveslideshow.php?CusID=<?php echo $_GET["slide_title"];?>" name="frmEdit" method="post">
<?php
$objConnect = mysql_connect("localhost","s56122201039","Supanat41554@") or die("Error Connect to Database");
$objDB = mysql_select_db("s56122201039");
$strSQL = "SELECT * FROM slideshow WHERE slide_title = '".$_GET["CusID"]."' ";
$objQuery = mysql_query($strSQL);
mysql_query('set names utf8' );
$objResult = mysql_fetch_array($objQuery);
if(!$objResult)
{
echo "Not found slide_title=".$_GET["CusID"];
}
else
{
?>
<table width="600" border="1">
<tr>
<th width="91"> <div align="center">slide_title</div></th>
<th width="98"> <div align="center">slide_image </div></th>
<th width="198"> <div align="center">slide_caption </div></th>
<th width="97"> <div align="center">slide_Linktext</div></th>
<th width="59"> <div align="center">slide_LinkURL</div></th>
</tr>
<tr>
<td><div align="center"><input type="text" name="slide_title" size="5" value="<?php echo $objResult["slide_title"];?>"></div></td>
<td><input type="text" name="slide_image" value="<?php echo $objResult["slide_image"];?>"></td>
<td><input type="text" name="slide_caption" value="<?php echo $objResult["slide_caption"];?>"></td>
<td><div align="center"><input type="text" name="slide_Linktext"  value="<?php echo $objResult["slide_Linktext"];?>"></div></td>
<td><div align="center"><input type="text" name="slide_LinkURL" value="<?php echo $objResult["slide_LinkURL"];?>"></div></td>
</tr>
</table>
<input type="submit" name="submit" value="submit">
<?php
}
mysql_close($objConnect);
?>
</form>

 <?php
 $objConnect = mysql_connect("localhost","s56122201039","Supanat41554@") or die("Error Connect to Database");
 $objDB = mysql_select_db("s56122201039");
 $strSQL = "UPDATE slideshow SET ";
 $strSQL .="slide_title = '".$_POST["slide_title"]."' ";
 $strSQL .=",slide_image = '".$_POST["slide_image"]."' ";
 $strSQL .=",slide_caption = '".$_POST["slide_caption"]."' ";
 $strSQL .=",slide_Linktext = '".$_POST["slide_Linktext"]."' ";
 $strSQL .=",slide_LinkURL = '".$_POST["slide_LinkURL"]."' ";
$strSQL .="WHERE slide_title = '".$_GET["CusID"]."' ";
mysql_query('set names utf8' );
$objQuery = mysql_query($strSQL);
if($objQuery)
{
echo "Save Done.";
}else{
echo "Error Save [".$strSQL."]";
}
mysql_close($objConnect);
?>