$("#toggle").click( function(event){
    event.preventDefault();
    if ($(this).hasClass("isDown") ) {
        $( ".navbar-fixed-top" ).animate({ "margin-top": "-62px" }, "fast" );  
        $( "#content" ).animate({ "margin-top": "5px" }, "fast" );
        $(this).removeClass("isDown");
    } else {
        $( ".navbar-fixed-top" ).animate({ "margin-top": "0px" }, "fast" );
        $( "#content" ).animate({ "margin-top": "80px" }, "fast" );
        $(this).addClass("isDown");
    }
    return false;
});