$( document ).ready(function() {
var widthSidebar = $("#menus").width();
var widthMenu = $("#sub-menus").width();
var widthScreen = $(window).width();
var reset = widthScreen-widthMenu-widthSidebar;
$("#content").width(reset);
});
var reset = (widthScreen-widthMenu-widthSidebar)/widthScreen*100;
$("#content").width(reset+"%");