SugarCRM, getting img and icons

$this->activity_type = "<img src='index.php?entryPoint=getImage&themeName=default&imageName={$this->activity_type}.gif' alt='{$this->activity_type}' title='{$this->activity_type}' /> {$this->activity_type}";

$this->activity_type = "<img src='".SugarThemeRegistry::current()->getImageURL($this->activity_type.'.gif')."' alt='{$this->activity_type}' title='{$this->activity_type}' /> {$this->activity_type}";