#header {
position: relative;
left: 0;
top: 0;
width: 90em;/*++++++++++++++++++*/
height: 3em;/*++++++++++++++++++*/
margin: 0;
padding: 0;
background-color: white;
}

.img_header, #nav_bar_main {
display: none;
}

#header a.bookmark, #header a.homepage, #header a.tell_friend {
top: 0.5em;
}