[Resuelto] Quiero poner un encabezado en mi web y no se como

lli.nav_element{display: none;}
li.nav_element a{display: none;}
h1#title{display: none;}
h2#title span {display: none;}
div.header{display: none;}
li.nav_element{list-style-type: none;}
li.nav_element{display: none;}



/*
Template name: Shades of Gray
Template URI: http://templates.arcsin.se/shades-of-gray-website-template/
Release date: 2006-11-05
Description: Monochrome, lightweight and totally liquid. Comes with three different layouts.
Author: Viktor Persson
Author URI: http://arcsin.se/

This template is licensed under a Creative Commons Attribution 2.5 License:
http://templates.arcsin.se/license/
*/

/* standard elements */
* {
   margin: 0;
   padding: 0;
}

a {text-decoration: none;}

body {
   background: #000000 url(http://i44.tinypic.com/3508gfr.jpg) repeat-y center top;
   color: #003300;
   font: normal 72.5% "verdana",verdana;
}

p,ul {
   font-size: 1.3em;
   padding-bottom: 1.2em;
}

blockquote {font: bold 1em sans-serif;}

code {
   background: #990000;
   display: block;
   font-size: 12px;
   margin: 0 10px 12px;
   overflow: auto;
   padding: 8px 10px;
   white-space: pre;
}

img {border: none;}

ul {margin-left: 2em;}
h1 {font: normal 1.7em arial;}
h2 {
   font: bold 1.7em arial,sans-serif;
   padding-bottom: 4px;
}

/* misc */
.clearer {clear: both;}
.stripes {
   background: #cccccc url();
   height: 10px;
}
.left {float: left;}
.right {float: right;}

/* header */
.header {
   background: #ffffff;
   border-bottom: 1px solid #ffffff;
   font: normal 2em sans-serif;
   height: 120px;
}
.header a {
   color: #ffffff;
   display: block;
   line-height: 120px;
   text-decoration: none;
   width: 100%;
}
.header span {padding-left: 32px;}
.header a:hover {
   background: #ffffff;
   color: #ffffff;
}

/* structure */
.container {
   border: 3px solid #ffffff;
   border-top: none;
}

.main {
   background: #ffffff;
   border-bottom: 1px solid #ffffff;
   border-left: 1px solid #ffffff;
}
.main .left {width: 64%;}
.main .right {width: 36%;}

.content {
   border-left: 1px solid #ffffff;
   border-top: 1px solid #cccccc;
   padding: 16px;
}

/* content elements */
.content h1 {
   background: url(URL) repeat-x left bottom;
   color: #ffffff;
   margin-bottom: 10px;
   padding: 6px 0 4px;
}
.content a {
   color: #ffffff;
   text-decoration: underline;
}
.content a:hover {color: #ffffff;}
.content .descr {margin-bottom: 5px;}

/* navigation */
.nav {background: #ffffff url(http://i39.tinypic.com/x2rnm8.jpg);}
.nav a {
   background: #ffffff url(http://i39.tinypic.com/x2rnm8.jpg);
   border-right: 1px solid #161616;
   color: #ffffff;
   float: left;
   font: bold 1em Verdana,sans-serif;
   line-height: 51px;
   padding: 0 20px;
}
.nav a:hover {
   background: #0099FF url(http://i40.tinypic.com/vuf5u.jpg);
}

/* sub-navigation */
.subnav {
   background: #99CCFF;
   border: 1px solid #FF0000;
   border-top-color: #FF0000;   
   padding: 12px;
}
.subnav h1 {padding-top: 8px;}
.subnav ul {margin: 0;}
.subnav li {
   background: url(http://i42.tinypic.com/2hy9wdg.jpg) no-repeat left bottom;
   list-style: none;
   margin: 0;
}
.subnav li a {
   color: #777;
   line-height: 2.4em;
   padding-left: 18px;
   text-decoration: none;
}
.subnav li a:hover {color: #FF0000;}

/* footer */
.footer {
   background: #003366;
   border-top: 1px solid #000000;
   color: #FFFFFF;
   padding: 3% 3% 1%;
}
.footer ul {
   border-top: 1px solid #000000;
   margin: 0;
}
.footer li {
   border-bottom: 1px solid #0000006;
   list-style: none;
}
.footer li a {
   display: block;
   line-height: 2em;
   padding-left: 4%;
   width: 96%;
}
.footer a {color: #CCCCCC;}
.footer a:hover {
   color: #CCCCCC;
   background: #222;
}
.col3,.col3center {
   float: left;
   width: 31%;
}
.col3center {margin: 0 3%;}

/* bottom */
.bottom {
   color: #FF0099;
   clear: both;
   font-size: 1.1em;
}
.bottom a, .bottom .right a:hover {color: #FFFFFF;}
.bottom .right, .bottom .right a {color: #FFFFFF;}