jquery check if screen size

if ($(window).width() < 960) {
   alert('Less than 960');
}
else {
   alert('More than 960');
}

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

$(window).resize(function() {
  var windowsize = $(window).width();
});

if (windowsize > 440) {
  //if the window is greater than 440px wide then turn on jScrollPane..
    $('#pane1').jScrollPane({
       scrollbarWidth:15, 
       scrollbarMargin:52
    });
}

$(document).ready(function() {
    if($(window).width() >= 1024) {
        $('a.expand').click();
    }
});