Validating form fields within Textarea

I am building a CMS system with FCKEditor.

I am successfully inserting (and saving to mySQL) form fields within the html content of a page.

I am only inserting form fields on the page and not the form tags - these are being added on the front end as part of my php code.

I would like to check that there are certain form fields loaded on the page when saving the data to the database - ie a field called 'Name' and a field called 'Email'

I have figured out how to iterate through form fields for normal html using 'elements' however as the form tags are not included I have not figured out how to iterate through the form fields within the textarea.

Has anyone experienced this before ?

Thanks

Nigel