.mattblackmenu ul{
margin: 0;
padding: 0;
font: bold 12px Verdana;
list-style-type: none;
border-bottom: 1px solid gray;
overflow: hidden;
width: 100%;
}

.mattblackmenu li{
display: inline;
margin: 0;
}

.mattblackmenu li a{
float: left;
display: block;
text-decoration: none;
margin: 0;
padding: 6px 8px; /*padding inside each tab*/
border-right: 1px solid white; /*right divider between tabs*/
color: white;
}

.mattblackmenu li a:visited{
color: white;
}

.mattblackmenu li a:hover{
background: black; /*background of tabs for hover state */
}

.mattblackmenu a.selected{
background: black; /*background of tab with "selected" class assigned to its LI */
}

.background {
   width: 800px;
   height: 305px;
   background-color:#424242;
}

.linha1 {
   width: 750px;
   height: 225px;
}

#transp {
        background-image: url(http://www.leoecia.com/imgs/bgs/bg_menu_principal.png) !important;
        filter: none !important;
        width: 100%;
        background-repeat: repeat-y;
}
<!--[if IE]>
#transp {
        background-image: none;
        filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=http://www.leoecia.com/imgs/bgs/bg_menu_principal.png,sizingMethod='scale');
}
<![endif]-->