viewing source of the main page shows the javascript for the menu duplicated:
<script type="text/javascript">
$(document).ready(function(){
$("ul.subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled - Adds empty span tag after ul.subnav
$("ul.topnav li a").hover(function() { //When trigger is clicked...
//Following events are applied to the subnav itself (moving subnav up and down)
$(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click
$(this).parent().hover(function() {
}, function(){
$(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up
});
//Following events are applied to the trigger (Hover events for the trigger)
}).hover(function() {
$(this).addClass("subhover"); //On hover over, add class "subhover"
}, function(){ //On Hover Out
$(this).removeClass("subhover"); //On hover out, remove class "subhover"
});
});
</script>
<meta charset="utf-8">
<link href="css/main-screen.css" rel="stylesheet" type="text/css">
<script type="text/javascript">
$(document).ready(function(){
$("ul.subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled - Adds empty span tag after ul.subnav
$("ul.topnav li a").hover(function() { //When trigger is clicked...
//Following events are applied to the subnav itself (moving subnav up and down)
$(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click
$(this).parent().hover(function() {
}, function(){
$(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up
});
//Following events are applied to the trigger (Hover events for the trigger)
}).hover(function() {
$(this).addClass("subhover"); //On hover over, add class "subhover"
}, function(){ //On Hover Out
$(this).removeClass("subhover"); //On hover out, remove class "subhover"
});
});
</script>
make sure that scrip tag only occurs on the navigation page, and not on the main page.