.horz_nlsmenu {
    z-index:1;
}
<!-- Roll-over off
.horz_nlsitemcontainer {
    height:10px;
}
.horz_nlsiconcell {width:1px;}
.horz_nlssubmenucell{width:30px;}
.horz_nlsitem {
    font-family:verdana;
    font-size:8pt;
    color:#000000;
    padding:2px 5px 2px 5px;
}
<!-- Roll-over on
.horz_nlsitemcontainerover {
    height:10px;

}
.horz_nlsiconcellover {width:1px;}
.horz_nlssubmenucellover {width:30px;}
.horz_nlsitemover {
    font-family:verdana;
    font-size:8pt;
    color:#7fbfe2;
    padding:2px 5px 2px 5px;
}

.horz_nlsitemdisable {
    font-family:verdana;
    font-size:8pt;
    color:#00000;
    padding:2px 5px 2px 5px;
}

.horz_nlsseparatorcontainer {padding-left:0px; width:1px;}
.horz_nlsseparator {
    height:10px;
    width:1px;
}

.horz_mtopleft {height:0px; width:0px;}
.horz_mtopright {height:0px; width:0px;}
.horz_mbottomleft {width:0px; height:0px;}
.horz_mbottomright {width:0px; height:0px;}
.horz_mtop {height:0px;}
.horz_mbottom {height:0px;}
.horz_mleft {width:0px;}
.horz_mright {width:0px;}

.horz_horzshadow {}
.horz_vertshadow {}
.horz_cornshadow {}