revised help screen

/**
 * Removes the default contextual help panel tabs and adds our custom help tab.  Contents for our custom tab are assumed
 * to be contained in a directory names "views" in a file named "sampleHelp.html".  Adjust as needed
 *
 * @param $strOldHelp string
 * @param $intScreenID integer
 * @param $objScreen object
 * @return string
 */
function mizzouAdjustHelpScreen($strOldHelp,$intScreenID,$objScreen)
{
    // we only want to adjust the help contents when working on the default post type
    if($objScreen->post_type == 'post'){
        // we only want to adjust the help contents if we can load our custom help contents
        if (FALSE !== $strHelpContents = file_get_contents(dirname(__FILE__).DIRECTORY_SEPARATOR.'views'.DIRECTORY_SEPARATOR.'sampleHelp.html')) {

            //get rid of all the default help tabs in the contextual help panel
            $objScreen->remove_help_tabs();//get rid of all the help tabs

            //remove the help panel sidebar
            $objScreen->set_help_sidebar('');

            //add our custom help tab
            $objScreen->add_help_tab(array(
                'id' => 'sample_help_tab',
                'title' => 'Sample Help Tab',
                'content' => $strHelpContents,
            ));
        }
    }

    return $strOldHelp;
}

add_filter('contextual_help','mizzouAdjustHelpScreen',10,3);