To changes your reddit's name (at the top) to an image. You must include the dimentions
you want your image to be.
 
.redditname a{
background:url(IMAGE);
height: ??px;
width: ??px;}

#header-bottom-left{
height: ??px;}

.redditname a{
text-indent:-9001px;
}

#header-img-a,
.redditname a,
.tabmenu {
display: inline;
float: left;}

.tabmenu{
position:relative;
top:100%;
margin-top:-16px!important;}


You can view an example of the Reddit CSS Stylesheet here.