pre checking radio button on form render

Hi there,

I've written the below based on one of your code solutions on another post and it works brilliantly. However I would like to know how to make the "None" radio button "checked" when the form renders.

[php]
add_filter("gform_pre_render_20", "populate_radios");

function populate_radios($form){
	global $post;
	$fieldstochange = array(33,35,36,37,38,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88);
	foreach ($fieldstochange as $fieldtochange) {
    //Creating choices
    $choices = array();
    			if(get_post_meta($post->ID,'ecpt_option1',true)) {
                    $choices[] = array("text" => "Option 1", "value" => "Option 1|10");
                }
                 if(get_post_meta($post->ID,'ecpt_option2',true)) {
                   $choices[] = array("text" => "Option 2", "value" => "Option 2|10");
                }
                 if(get_post_meta($post->ID,'ecpt_option3',true)) {
                    $choices[] = array("text" => "Option 3", "value" => "Option 3|10");
                 }
                  if(get_post_meta($post->ID,'ecpt_option4',true)) {
                    $choices[] = array("text" => "Option 4", "value" => "Option 4|10");
                 }
                  if(get_post_meta($post->ID,'ecpt_option5',true)) {
                    $choices[] = array("text" => "Option 5", "value" => "Option 5|10");
                 }
                    $choices[] = array("text" => "None", "value" => "None");

    $inputs = array();
    			 if(get_post_meta($post->ID,'ecpt_option1',true)) {
                    $inputs[] = array("label" => "Option 1", "id" => $fieldtochange.'.1');
                 }
                  if(get_post_meta($post->ID,'ecpt_option1',true)) {
                    $inputs[] = array("label" => "Option 2", "id" => $fieldtochange.'.2');
                 }
                  if(get_post_meta($post->ID,'ecpt_option1',true)) {
                    $inputs[] = array("label" => "Option 3", "id" => $fieldtochange.'.3');
                 }
                  if(get_post_meta($post->ID,'ecpt_option1',true)) {
                   $inputs[] = array("label" => "Option 4", "id" => $fieldtochange.'.4');
                 }
                  if(get_post_meta($post->ID,'ecpt_option1',true)) {
                    $inputs[] = array("label" => "Option 5", "id" => $fieldtochange.'.5');
                 }
                    $inputs[] = array("label" => "None", "id" => $fieldtochange.'.6');

    //Adding items to field id 8. Replace 8 with your actual field id. You can get the field id by looking at the input name in the markup.
    foreach($form["fields"] as &$field){
        //replace 2 with your checkbox field id
        if($field["id"] == $fieldtochange){
            $field["choices"] = $choices;
            $field["inputs"] = $inputs;
        }
    }
}
    return $form;
}

thanks in advance!

Awesome, works a treat, thanks David!