use form image instead of submit button

Hello, I use image instead of submit form button and I tried to update user information, But it does not work. What I need to do to resolve this problem??

<?PHP
require_once('../log/dbini.php');
$conn=mysql_connect($DBSERVER,$DBUSER,$DBPWD);
$select_db=mysql_select_db($DBNAME,$conn);

$MYNAME=$_REQUEST['myname'];
$sql="UPDATE tbluser SET MYNAME='".$MYNAME."' WHERE USER1 = '".$_SESSION['USER1']."'";
$rst=mysql_query($sql);

?>

<form action="<?=$_REQUEST['PHP_SELF']?>" method="post">
<input type="text" name="myname">
<input type="image" name="update" value="update"  src="abc.jpg">
</form>
portal123Asked:
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tolgaongCommented:
<form action="<?=$_REQUEST['PHP_SELF']?>" method="post">
<input type="text" name="myname">
<input type="submit" name="submit">
<img src="abc.jpg" onclick="document.forms[0].submit.click"> // you can check the form onsubmit event
<img src="abc.jpg" onclick="document.forms[0].submit()">     // you cannot check before the submit...
</form>
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spdaniel91Commented:
$MYNAME=$_REQUEST['myname'];
$_REQUEST['PHP_SELF']

NEVER ever use $_REQUEST. Because, imagine the form says the name is Nick, but the url is:

http://justexample.com/add.php?name=Dan

What one does it use? Sometimes one, sometimes another. Always use $_GET or $_POST.
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