// JavaScript Document
function MenuOn(x){
	obj = document.getElementById("submenu"+x).style.visibility = "visible";
}

function MenuOff(x){
	obj = document.getElementById("submenu"+x).style.visibility = "hidden";
}
//ドロップダウン
function mainmenu(){  
$(" #nav li").hover(function(){  
        $(this).find('ul:first').css({visibility: "visible",display: "none"}).show(200);  
        },function(){  
        $(this).find('ul:first').css({visibility: "hidden"});  
        });  
}    
    
$(document).ready(function(){                     
    mainmenu();
});