Ciao ragazzi,ho un problema con il mio layout:

codice:
body {
background: url('body.JPG'); 
font-size: 14px;
font-family: Verdana, Arial, SunSans-Regular, Sans-Serif;
color: #FFFFFF;
padding: 0px;
margin: 0px;}
a {padding: 0px; text-decoration:underline; color: #FFFFFF; font-size: 20px;}




/* ----------logo-------------- */

div#header {

width: 70%;
height: 114px;
padding: 0px;
margin: 0px;
float: left;}




/* ----------classifica-------------- */

div#banner {

width: 20%;
height: 114px;
padding: 0px;
margin: 0px;
float: right;
margin-right: 10px;}
img {border: none}


/* ----------barra titolo-------------- */

div#title {

background:#00CC00;
color:#000000;
line-height:1.4;
width: 70%;
min-height: 15px;
float:left;
border:1px solid #000000;}



/* ----------content 1-------------- */

div#content_1 {

float: left;
line-height:1.4;
width: 70%;
border:1px solid #000000;
background: url('bodymenu.jpg') top left;}



/* ----------content 2-------------- */

div#content_2 {

float: right;
line-height:1.4;
width: 13%;

margin-left: 10px;
margin-right: 10px;}




/* ----------lista navigazione-------------- */

div#navigation {

float:left;
width: 13%;
background: url('bodymenu.jpg') top left;
border:1px solid #000000;
margin-left: 10px;
margin-right: 10px;}
ul{margin:0px 0; padding:0; list-style-type:none;}
li{margin-bottom: 10px;}




/* ----------copyright-------------- */

div#footer {

clear:both;
width:80%;
min-height: 20px;
background: url('bodyfooter.jpg') top left;
margin-left: auto;
margin-right: auto;
border:1px solid #000000;
padding: 10px;}
Vi spiego:

Io ho inserito il bordo a 1px colore nero sia nella "barra titolo" e in "content_1",il problema è che essendo attaccati uno dei bordi si vede doppio,osservate:

http://beamanager.altervista.org/gioco/game_index.php

Vi ringrazio!