build_html() Purpose: Associates a cgi obj ($cgi) with pjx object, inserts javascript into element and constructs the page, or part of the page. AJAX applications are designed to update only the section of the page that needs it - the whole page doesn't have to be redrawn. L applications use the build_html() method to take care of this: if the CGI parameter C exists, then the return from the L-exported function is sent to the page. Otherwise, the entire page is sent, since without an C param, this has to be the first time the page is being built. Arguments: The CGI object, and either a coderef, or a string containing html. Optionally, you can send in a third parameter containing information that will get passed directly to the CGI object header() call. Returns: html or updated html (including the header) Called By: originating cgi script