#twocols{ /*the columns that gets dropped down over yours might be different*/
  z-index:20;
}
 
#leftcol{  /*the columns that gets dropped down over yours might be different*/
  z-index:10;
}
 
.moduletablemainnav { /* I have absolutely positioned the module, you might have a different scheme*/
  z-index:100;
  margin:0;
  padding:0;
}

#mainlevelmainnav,#mainlevelmainnav ul {
  float:left;
  list-style:none;
  line-height:1em;
  background:transparent;
  font-size:20px;
  font-weight:bold;
  margin:0;
  margin-left:60px;
  padding:0;
}
 
#mainlevelmainnav a {
  display:block;
  color:#8d8673;
  text-decoration:none;
  margin-right:40px;
  padding:0.3em;
}

#mainlevelmainnav a:hover {
  display:block;
  color:#254059;
  text-decoration:none;
  margin-right:40px;
  padding:0.3em;
}
 
#mainlevelmainnav li {
  float:left;
  padding:0;
}
 
#mainlevelmainnav li ul  {
  width:150px;
  position:absolute;
  left:-999em;
  height:auto;
  font-weight:400;
  background:black;
  border:#254059 1px solid;
  margin:0;
}
 
#mainlevelmainnav li li {
  width:150px;
}
 
#mainlevelmainnav li ul a {
  width:150px;
  color:#8d8673;
  font-size:0.9em;
  line-height:1em;
  font-weight:400;
}

#mainlevelmainnav li ul a:hover {
  width:150px;
  color:black;
  font-size:0.9em;
  line-height:1em;
  font-weight:400;
}
 
#mainlevelmainnav li:hover ul ul,#mainlevelmainnav li:hover ul ul ul,#mainlevelmainnav li.sfhover ul ul,#mainlevelmainnav li.sfhover ul ul ul{
  left:-999em;
}
 
#mainlevelmainnav li:hover ul,#mainlevelmainnav li li:hover ul,#mainlevelmainnav li li li:hover ul,#mainlevelmainnav li.sfhover
  ul,#mainlevelmainnav li li.sfhover ul,#mainlevelmainnav li li li.sfhover ul {
  left:auto;
  z-index:6000;
}
 
#mainlevelmainnav li li:hover,#mainlevelmainnav li li.sfhover {
  background:#254059;
}