[css-d] Close the GAP

[Alan (Neweb Ireland)]

Hi,
I'm having problems closing the gap on the nav menu for the following site.
http://newebirl.ie/mnsite/
I'd like the green bar (nav) to be flush with the image above it and the 
gray box under it so you don't see any white space.

Here is the CSS I'm using:

CSS:
#masthead {width: 950px; margin: 0 auto 0 auto; background: transparent; 
clear:both;}
.logo {float: left; margin: 10px 0 0 2px; width: 310px; }
.logo img {border: 0; }
.mastheadimg { border-top: 5px solid #056839; margin: 0px; padding: 0px;}
.slogan { position:relative; float: right; width: 300px; height: 40px; 
clear: right; margin: 30px 10px 0 0; color: #CCC; text-align: right;}
.social { position:relative; float: right; width: 300px; height: 40px; 
clear: right; text-align: right;}

/* Menu master nav Settings */
#mainNav{display: block;width: 950px;margin: 0 auto 0 auto; background: 
url(images/menubar.png) repeat-x top left;}
#mainNav ul { margin: 5px 0 5px 0; padding: 5px 0 5px 10px;}
#mainNav li {display: inline; list-style:none; padding: 0 20px 0 0;}
#mainNav li a {color: #fff; text-decoration: none; font-weight: bold;}
#mainNaV li a:hover {text-decoration: underline;}

This is the page code:
<div id="masthead">
<div class="logo"><a href="<?php echo get_option('home'); ?>"><img 
src="http://newebirl.ie/wp-content/themes/cthemeMN/images/mnlogo.png"; 
alt="thevickerys"></a></div>
<div class="slogan"><?php bloginfo( 'description' ); ?></div>
<div class="mastheadimg"><img 
src="http://newebirl.ie/wp-content/themes/cthemeMN/images/mastheadbg.jpg"; alt="Mediation 
Now"/></div>
</div>
<!-- Master Nav Area -->
<div id="mainNav"><?php wp_nav_menu( $args ); ?></div>

I just can't get that gap closed !!!
Anyone got any ideas?

Alan
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