Javascript user agent sniffing (don't recommend trying it, but)... #mobile

mobile-detect.min.js

/*
* JS Redirection Mobile
*
* Developed by
* Sebastiano Armeli-Battana (@sebarmeli) - http://www.sebastianoarmelibattana.com
* Dual licensed under the MIT or GPL Version 3 licenses.
* @version 0.9.5
*/
if(!window.SA){window.SA={};}SA.redirection_mobile=function(m){var c=function(y){var x=new Date();x.setTime(x.getTime()+y);return x;};var q=function(C){if(!C){return;}var x=document.location.search,D=x&&x.substring(1).split("&"),z=0,B=D.length;for(;z<B;z++){var y=D[z],A=y&&y.substring(0,y.indexOf("="));if(A===C){return y.substring(y.indexOf("=")+1,y.length);}}};var a=navigator.userAgent.toLowerCase(),s="false",f="true",w=m||{},r=w.noredirection_param||"noredirection",t=w.mobile_prefix||"m",o=w.mobile_url,d=w.mobile_scheme?w.mobile_scheme+":":document.location.protocol,p=document.location.host,i=q(r),j=o||(t+"."+(!!p.match(/^www\./i)?p.substring(4):p)),k=w.cookie_hours||1,g=w.keep_path||false,v=w.keep_query||false,h=w.tablet_url||j,b=!!(a.match(/(iPhone|iPod|blackberry|android 0.5|htc|lg|midp|mmp|mobile|nokia|opera mini|palm|pocket|psp|sgh|smartphone|symbian|treo mini|Playstation Portable|SonyEricsson|Samsung|MobileExplorer|PalmSource|Benq|Windows Phone|Windows Mobile|IEMobile|Windows CE|Nintendo Wii)/i));if(document.referrer.indexOf(j)>=0||i===f){if(window.sessionStorage){window.sessionStorage.setItem(r,f);}else{document.cookie=r+"="+f+";expires="+c(3600*1000*k).toUTCString();}}var u=(window.sessionStorage)?(window.sessionStorage.getItem(r)===f):false,l=document.cookie?(document.cookie.indexOf(r)>=0):false;if(!!(a.match(/(iPad|SCH-I800|xoom|kindle)/i))){var e=(w.tablet_redirection===f||!!w.tablet_url)?true:false;b=false;}if((e||b)&&!(l||u)){if(w.beforeredirection_callback){if(!w.beforeredirection_callback.call(this)){return;}}var n="";if(g){n+=document.location.pathname;}if(v){n+=document.location.search;}if(e){document.location.href=d+"//"+h+n;}else{if(b){document.location.href=d+"//"+j+n;}}}};

mobile-redirect.html

<script type="text/javascript" src="/js/mobile-redirect.min.js"></script>
<script type="text/javascript">
    SA.redirection_mobile ({
    mobile_url : "www.YOURSITE.com/mobile",
    noredirection_param:"fullsite",
    cookie_hours : "1"
  });
</script>