himali

theme is like ‘responsive theme’… but only change that i want one additional image in header below menu bar

actually in header, it contains
logo of site and name of site
below that menu bar
below that one image that is uploaded by user

in appearance->header I set logo of site
now i dont understand how to add image and how user can upload it..
my code is

<div id="header">
     <div id="logo">
            <a href="<?php echo home_url('/'); ?>"><img src="<?php header_image(); ?>" width="<?php if(function_exists('get_custom_header')) { echo get_custom_header() -> width;} else { echo HEADER_IMAGE_WIDTH;} ?>" height="<?php if(function_exists('get_custom_header')) { echo get_custom_header() -> height;} else { echo HEADER_IMAGE_HEIGHT;} ?>" alt="<?php bloginfo('name'); ?>" /></a>
        </div><!-- end of #logo -->
      <div id="pgimage">
     //want image
      </div><!-- end of #pgimage -->
 </div><!-- end of #header -->