foreach( $links as $s=>$link ) {
   printf( $this->before_item, esc_attr( $s ) );
   echo '<a href="' . $link . '" target="_blank" . title="' . $this-

>services[$s] . '"><img src="'. plugins_url( '/images/'. strtolower ($this->services[$s]) 

.'.png', __FILE__ ) .'" alt="' . $this->services[$s] . '" /></a>';