Drop downs sidder fast i IE

Jeg har en dropdown menu som driller i IE. Ikke hele tiden men ofte så sidder dropdownene fast hvis du hurtigt fører musen fra den ene til den anden dropdown.

Siden er her:

http://briannielsengolf.dk

Nedenfor kan I se CSS til menuen. Nogen gode forslag til en løsning?



#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*/
    position:absolute;
    top:9px;
    left:3px;
    z-index:100;
    margin:0;
    padding:0;
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 0.8em;
    font-weight: bold;
}

#mainlevelmainnav,#mainlevelmainnav ul {
    float:left;
    list-style:none;
    line-height:1.4em;
    background:transparent;
    margin:0;
    padding:0;
    text-transform: uppercase;
}

#mainlevelmainnav a {

    display:block;
    color:#ffffff;
    text-decoration:none;
    margin-right:56px;
    padding:0.3em;
   
}

#mainlevelmainnav li {
   
  float:left;
  padding:0;
}

#mainlevelmainnav li ul  {

    position:absolute;
    left:-999em;
    line-height:0.9em;
    width:7em;
    background:#a7ce38;
    margin:0;
    font-weight: bold;
    visibility: visible;
    overflow: visible;
    text-transform: none;
}

#mainlevelmainnav li li {

    width:7em;
      border-top-width: 1px;
    border-top-style: solid;
    border-top-color: #FFFFFF;
}

#mainlevelmainnav li ul a {
    width:7em;
    color:#ffffff;
    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
  l,#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-color: #7ea928;
   
}