function mainmenu(){
    $(" #topnav ul#biz ").css({
        display: "none"
    }); // Opera Fix
    $(" #topnav li#laempresa").hover(function(){
        $(this).find('ul#biz').css({
            visibility: "visible",
            display: "none"
        }).show(700);
    }, function(){
        $(this).find('ul#biz').css({
            visibility: "hidden"
        });
    });
	$(" #topnav ul#biz li#jboard").hover(function(){
        $(this).find('ul#board').css({
            visibility: "visible",
            display: "none"
        }).show(700);
    }, function(){
        $(this).find('ul#board').css({
            visibility: "hidden"
        });
    });
}
$(document).ready(function(){
    mainmenu();
});