Log in Error Need Help

[csun]

i got this error can anybody help me below is the code..

Warning: Cannot modify header information - headers already sent by (output started at C:\Server\htdocs\index.php:7)


<?php
ob_start();
//include the header.php file
require("config.php");
//Write the login form out
echo "<form method=post action=index.php?action=check><table><tr><td>Usern ame:</td><td><input type=text name=Uname></td></tr><tr><td>Password:</td><td><input type=password name=Pword></td></tr>
<tr><td><a href=forgotpassword.php>Forgot password</a></td><td><input type=submit value=Login></td></tr></table>
Don't have an account yet? <a href=register.php>Register Here</a><br></form>";

//check the input
if($_GET['action'] == 'check')
{
//find the user
$result = mysql_query("SELECT * FROM loginphp WHERE Uname='{$_POST['Uname']}'") or die(mysql_error());
$row = mysql_fetch_array( $result ); //set $row to result
if($row['Uname'] == "")
{
echo error();
}
else
{
//$enc = md5($_POST['Pword']);
$enc = $_POST['Pword'];
if($row['Pword'] == $enc)
{
$_SESSION['Uname'] = $_POST['Uname'];
$_SESSION['lp'] = 'pl';
header("Location: main.php");
exit;
}
else
{
echo error();
}
}
}
function error()
{
echo "<b>The username/password is incorrect</b>";
}
?>

[Ryan Fait]

You can only use redirects before anything is written to the page. You need to stick header("Location: main.php"); above the echos.