css - CSS inconsistancy, image not displaying correctly

Question

The link to the content can be seen here: http://bit.ly/K6jRGI

The issue is that our black line divider is not showing between Home and Guide.

The divider is showing for all apart from the first two buttons.

Does anyone know why this is, and what I'm missing?

.top_menu ul li{
list-style: none;
background: url("images/bg_li.gif") no-repeat right center transparent;
float: left;
padding-top: 2px;
margin-left: 0px;
}

Answer 1

According to Firebug, on line 241 of style.css:

.top_menu ul li:first-child {
    background: none;
}