Script Help for suitelet and portlet simple form

I am hope someone with a keen eye, can take a quick look at my portlet script and suitelet.  I want to create a simple straight forward form in a portlet that will capture several fields,  example:
A Lost Sale

Create Customer, sales rep, product, qty size, color date, reason

I have added the customer field (works)  when I start adding other fields I get an error as follows: [h=3]"A User Error Has Occurred[/h]  You have entered an invalid form element name. It must be prefixed with "custpage", unique, lowercase, and cannot contain any non-alphanumeric characters (except for the underscore character) in order to be added to the form or sublist."