I have an index.php file, referencing a header.htm file. The header contains a logo, picture and drop-down menu. If the header.htm file is displayed alone, ie. www.mydomain.com/header.htm, it displays correctly. However, when displayed as part of the index.php file, ie. www.mydomain.com/index, the header.htm file drops approximately 21px, almost as though there’s a 21px top margin set. However, all the margins are set to 0.
Does anyone have any ideas why this is happening and how I can fix it?