Use this code to add an OnClick event to a particular submit button.

add_action('frm_submit_button_action', 'your_function_name');
function your_function_name($form){
  if($form->id == 5){ //change 5 to the ID of the form you would like this inserted in
    echo ' onclick="do something"';
  }
}

Prevent error codes from showing via browser tooltips.

add_action('frm_submit_button_action', 'dont_validate_this');
function dont_validate_this(){
  echo ' formnovalidate="true"';
}