Help! mysql_num_rows() error!

[Sacha1234]

I keep getting the error "mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/weloveco/public_html/checklogin.php on line 25
Wrong password or Username"

<?php 
ob_start();
include 'my_sql_connection.php';

$sql="SELECT * FROM weloveco_blink WHERE user_email = '$useremail' and user_password='$userpassword'";

$result=mysql_query($sql);

$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1)
	{
	header ("Location: login_success.php");
	}
	else {
		echo "Wrong password or Username";
	}
	ob_end_flush();
	?>

</html>

[anakadote]

There must be something wrong with your query. Try this and see what error you get:

$result=mysql_query($sql) or die(mysql_error());

[Sacha1234]

This is the error im getting now..

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Resource id #2' at line 1

[anakadote]

Let's see the actual query:

$sql="SELECT * FROM weloveco_blink WHERE user_email = '$useremail' and user_password='$userpassword'";

echo $sql;

$result=mysql_query($sql) or die(mysql_error()); 

[bradgrafelman]

Also, where are the variables $useremail and $userpassword defined?