lerrrr on "Question about resizing header?"

I have a bit of a problem: I have changed some code for my header, and I'm not entirely sure what I've done, but now my header is much bigger (bigger than I want it). The code I'm using for my header is:

a,h2,h2 a,h2 a:hover,h2 a:visited,h3,h3 a,h3 a:hover,h3 a:visited,#sidebar h2,#wp-calendar caption,cite {
font-size:140%;
color:#C9BE62!important;
}

#headerimg .description {
text-decoration:none;
color:#C9BE62!important;
}

#title; font-face {
font-family:'Reenie Beanie';
font-style:normal;
font-weight:normal;
}

@font-face {
font-family:'Reenie Beanie';
font-style:normal;
font-weight:normal;
}

div.sidebar {
float:left;
overflow:hidden;
width:140px;
margin:0 0 0 -200px;
}

#sidebar {
display:inline;
float:right;
width:180px;
margin:80px 0 0 10px;
}

.clearfix:after {
display:none;
}

#header {
border-bottom:0 solid #C9BE62;
background:transparent url('http://postwittycommentshere.files.wordpress.com/2010/09/tsvaatar2new2-e1283937406477.jpg');
position:relative;
width:920px;
height:250px;
padding:80px 0;
}

#header #title a {
color:C9BE62!important;
width:920px;
height:250px;
}

#title {
font:normal 35px/35px;
font-family:"Times New Roman", Times, serif;
border-bottom:solid 4px #C9BE62;
padding-bottom:180px;
margin-bottom:0;
}

#nav {
font-size:180.5%;
padding:0 1.2em;
}

body {
font-size:67.5%;
font-family:'Lucida Grande', Verdana, Arial, Sans-Serif;
background:url('http://postwittycommentshere.files.wordpress.com/2010/09/blogbackgroundnewdimension.jpg');
color:#C9BE62;
text-align:center;
}

I'll link you to my blog as well:
http://postwittycommentshere.wordpress.com/

As you can see, the header touches the top border, and is quite thick - I want some space between the top of the header and the top of the page (so you can see the background behind at the top), and I want it to be slightly narrower. Can anybody suggest a way for me to do this? I would also like to center my navigation bar, and move it above the gold line (the one that it is currently underneath). Any help you guys could offer would be much appreciated, and please keep it as simple as possible - I am very new to this! Thanks guys =)