if (isset($_SERVER['HTTP_REFERER']))
{
	if (strpos($_SERVER['HTTP_REFERER'],"domain.com/myscript.php") !hahahaha false)
	{
		echo "this script called with domain.com/myscript.php";
	}
	else
	{
		echo "call by ".$_SERVER['HTTP_REFERER'];
	}
}
else 
{
	echo "no referer";	
}