submenu problem in IE

[Rick789]

Hello, I'm not positive this is a CSS problem but I thought I would see if anyone here could help. I am using javascript to display a submenu when rolling over a menu item. It works fine in Firefox, but in IE (version 7) the submenu dissapears when rolling the cursor over some of the choices. I have noticed that the submenu goes away when the cursor moves over a point where there is an image or text behind the submenu. I'm not sure what the problem is and I'm not an expert but I've attempted to play with the CSS file to fix it. I managed to minimize the 'gaps' between each submenu item and it's fine in Firefox, but the problem continues to exist in IE7. Anyone know why this is happening?

http://ufflfootball.net/

CSS file:

.horizontalcssmenu ul{
margin: 0;
padding: 0;
list-style-type: lower-alpha;
vertical-align: top;
}

/*Top level list items*/
.horizontalcssmenu ul li{
position: relative;
display: inline;
float: left;
background-color: #CCCCCC;
top: auto;

}

/*Top level menu link items style*/
.horizontalcssmenu ul li a{
display: block;
width: 120px; /*Width of top level menu link items*/
padding: 2px 8px;
border: 1px solid #202020;
border-left-width: 0;
text-decoration: none;
background: url(menubg.gif) center center repeat-x;
color: #CCCCCC;
font: bold 13px Tahoma;
}

/*Sub level menu*/
.horizontalcssmenu ul li ul{
left: 0;
top: 0;
border-top: 3px solid #202020;
position: absolute;
display: block;
visibility: hidden;
z-index: 100;
}

/*Sub level menu list items*/
.horizontalcssmenu ul li ul li{
display: block;
float: none;
}


/* Sub level menu links style */
.horizontalcssmenu ul li ul li a{
width: 125px; /*width of sub menu levels*/
font-weight: normal;
padding: 2px 5px;
background: #999999;
color: #000000;
border-width: 0 1px 1px 1px;
}

.horizontalcssmenu ul li a:hover{
background: url(menubgover.gif) center center repeat-x;
}

.horizontalcssmenu ul li ul li a:hover{
background: #CCCCCC;
}

.horizontalcssmenu .arrowdiv{
position: absolute;
right: 0;
background: transparent url(menuarrow.gif) no-repeat center left;
}

* html p#iepara{ /*For a paragraph (if any) that immediately follows menu, add 1em top spacing between the two in IE*/
padding-top: 1em;

}

/* Fix IE. Hide from IE Mac \*/
* html ul li { float: left; }
* html ul li a { height: 1%; }
/* End */


/* Holly Hack for IE \*/
* html .horizontalcssmenu ul li { float: left; height: 1%; }
* html .horizontalcssmenu ul li a { height: 1%; }
/* End */