m_anis / commitstrip.com next and previous page using keyboard

// ==UserScript==
// @name            commitstrip.com next and previous page using keyboard
// @namespace		com.phinisistudio.js
// @version			0.1
// @description		Getting tired of clicking commitstrip.com next and previous page? this is the solution
// @author			Muhammad Anis
// @include			http://*commitstrip.com/*/
// @include			http://*commitstrip.com/*/page/*
// @require			http://code.jquery.com/jquery-1.7.2.min.js
// ==/UserScript==

(function($){
    //register keydown left arrow and right arrow
    $("body").keydown(function(e){
        if(e.keyCode == 37) { // left    	
        var prevLink = $('.previouspostslink').first();
        if(prevLink.length > 0){
            window.location.href=prevLink.attr('href');
        }else{
            alert("There is no more previous page");
        }
    }
    else if(e.keyCode == 39) { // right    
        var nextLink = $('.nextpostslink').first();
        if(nextLink.length > 0){
            window.location.href=nextLink.attr('href');
        }else{
            alert("There is no more next page");
        }
    }
  });
 })(jQuery);