Code some simple form validation (sbchp)

We have an existing PHP site with a MySQL database. We would like some minor modifications made to one page. We have a form which is already coded, which allows users of the site to change their password. It asks for their existing password, a new one and to confirm their new one. This all works fine. What you will need to do is code the field validation and error messages to match some validation we have used elsewhere in the site. Please read the attached document for full details and instructions, and feel free to ask any questions. You will be given full FTP and Cpanel access.