Detect window width on the fly in jQuery

I am using a template and it come with a jQuery function to detect the window width, but it only works if you open the window up or refresh the page, not when you adjust the window width.. From what IU have read I need to integrate the resize function into my codebase

$(window).resize(function()

but as my jQuery is limited I'm not sure how to put it in this script

var ww = $(window).width();

/* Menu */
$(document).ready(function() {
"use strict";
$('body').find("#mainmenu li a").each(function() {
    if ($(this).next().length > 0) {
        $(this).addClass("parent");
    }
});

$('body').find(".toggleMenu").click(function(e) {
    e.preventDefault();
    $(this).toggleClass("active");
    $('body').find("#mainmenu").toggle();
});
adjustMenu();
});


 $(window).load(function () {
 $('body').find("#mainmenu").css('pointer-events', 'auto');
 });

var adjustMenu = function() {
"use strict";
if (ww < 900) {
    $('body').find(".toggleMenu").css("display", "inline-block");
    if (!$('body').find(".toggleMenu").hasClass("active")) {
        $('body').find("#mainmenu").hide();
    } else {
        $('body').find("#mainmenu").show();
    }
    $('body').find("#mainmenu li").unbind('mouseenter mouseleave');
    $('body').find("#mainmenu li a.parent").unbind('click').bind('click',  function(e) {
        e.preventDefault();
        $(this).parent("li").toggleClass("hover");
    });
} 
else if (ww >= 900) {
    $('body').find(".toggleMenu").css("display", "none");
    $('body').find("#mainmenu").show();
    $('body').find("#mainmenu li").removeClass("hover");
    $('body').find("#mainmenu li a").unbind('click');
    $('body').find("#mainmenu li").unbind('mouseenter mouseleave').bind('mouseenter mouseleave', function() {
    $(this).toggleClass('hover');
    $(this).toggleClass('activelink');
    $(this).find("ul").toggleClass('animatedfast');
    $(this).find("ul").toggleClass('fadeInUp');
    });
    $('body').find("#mainmenu ul li").unbind('mouseenter mouseleave').bind('mouseenter mouseleave', function() {
        $(this).toggleClass('hover');
        $(this).find("ul li").toggleClass('animatedfast');
        $(this).find("ul li").toggleClass('fadeInLeft');
    });
  }
    };

I can see that the logic is taking place in the adjustMenu function, so would I wrap that in the resize function?