If you paste this into your custom CSS, you'll get it:

* html span.ljuser{
background-image: url("http://i911.photobucket.com/albums/ac314/sazzk/userhead-1.gif") !important;
background-repeat: no-repeat;
background-position: left middle;
padding: 0px 16px 16px 0px !important;
}
* html span.ljuser img{
visibility: hidden;
}

/* icon for users */
.ljuser img[src*="userinfo.gif"] {
width: 0;
height: 0;
background-repeat: no-repeat;
background-image: url("http://i911.photobucket.com/albums/ac314/sazzk/userhead-1.gif") !important;
padding: 16px 16px 0 0 !important;
}