var mobile_device_agent = navigator.userAgent.toLowerCase();

function is(regular_expression) { return (mobile_device_agent.search(regular_expression) != -1); }

function is_iPad() { return (is("ipad") && is("webkit")); }

function is_iPod() { return is("ipod"); }

function is_iPhone() { return (is("iphone") && !is_iPad() && !is_iPod()); }


function is_iOS() { return(is_iPhone() || is_iPad() || is_iPod()); } // Apple OS

function isMobileDevice()
{
 // SPECIFIC DETECTIONS

 if (is_iOS()) return true;
 if (is("android")) return true;
 if (is("blackberry|playbook|vnd\.rim")) return true;
 if (is("hp-tablet|hpwos|touchpad")) return true;
 if (is("windows phone os 7")) return true;
 if (is("windows phone|windows ce|iris|3g_t|opera mobi")) return true;
 if (is("opera mini")) return true;
 if (is("opera mobi|symbian os; .+ opera ")) return true;
 if (is("pre\/|palm os|webos|xiino|blazer|hiptop|avantgo|plucker|elaine|palm")) return true;

 // GENERIC DETECTIONS

 if (mobile_device_agent.search("mobile|mobi|mini|smartphone|symbian|mmp|midp|pocket|psp|treo|vodaphone|wap|kindle|tres|phone|wireless") != -1) return true;

 var trimmed_agents = "1207,3gso,4thp,501i,502i,503i,504i,505i,506i,6310,6590,770s,802s,a wa,abac,acer,acoo,acs-,aiko,airn,alav,alca,alco,amoi,anex,anny,anyw,aptu,arch,argo,aste,asus,attw,au-m,audi,aur ,aus ,avan,beck,bell,benq,bilb,bird,blac,blaz,brew,brvw,bumb,bw-n,bw-u,c55/,capi,ccwa,cdm-,cell,chtm,cldc,cmd-,cond,craw,dait,dall,dang,dbte,dc-s,devi,dica,dmob,doco,dopo,ds-d,ds12,el49,elai,eml2,emul,eric,erk0,esl8,ez40,ez60,ez70,ezos,ezwa,ezze,fake,fetc,fly-,fly_,g-mo,g1 u,g560,gene,gf-5,go.w,good,grad,grun,haie,hcit,hd-m,hd-p,hd-t,hei-,hiba,hipt,hita,hp i,hpip,hs-c,htc ,htc-,htc_,htca,htcg,htcp,htcs,htct,http,huaw,hutc,i-20,i-go,i-ma,i230,iac,iac-,iac/,ibro,idea,ig01,ikom,im1k,inno,ipaq,iris,jata,java,jbro,jemu,jigs,kddi,keji,kgt,kgt/,klon,kpt ,kwc-,kyoc,kyok,leno,lexi,lg g,lg-a,lg-b,lg-c,lg-d,lg-f,lg-g,lg-k,lg-l,lg-m,lg-o,lg-p,lg-s,lg-t,lg-u,lg-w,lg/k,lg/l,lg/u,lg50,lg54,lge-,lge/,libw,lynx,m-cr,m1-w,m3ga,m50/,mate,maui,maxo,mc01,mc21,mcca,medi,merc,meri,midp,mio8,mioa,mits,mmef,mo01,mo02,mobi,mode,modo,mot ,mot-,moto,motv,mozz,mt50,mtp1,mtv ,mwbp,mywa,n100,n101,n102,n202,n203,n300,n302,n500,n502,n505,n700,n701,n710,nec-,nem-,neon,netf,newg,newt,nok6,noki,nzph,o2 x,o2-x,o2im,opti,opwv,oran,owg1,p800,palm,pana,pand,pant,pdxg,pg-1,pg-2,pg-3,pg-6,pg-8,pg-c,pg13,phil,pire,play,pluc,pn-2,pock,port,pose,prox,psio,pt-g,qa-a,qc-2,qc-3,qc-5,qc-7,qc07,qc12,qc21,qc32,qc60,qci-,qtek,qwap,r380,r600,raks,rim9,rove,rozo,s55/,sage,sama,samm,sams,sany,sava,sc01,sch-,scoo,scp-,sdk/,se47,sec-,sec0,sec1,semc,send,seri,sgh-,shar,sie-,siem,sk-0,sl45,slid,smal,smar,smb3,smit,smt5,soft,sony,sp01,sph-,spv ,spv-,sy01,symb,t-mo,t218,t250,t600,t610,t618,tagt,talk,tcl-,tdg-,teli,telm,tim-,topl,tosh,treo,ts70,tsm-,tsm3,tsm5,tx-9,up.b,upg1,upsi,utst,v400,v750,veri,virg,vite,vk-v,vk40,vk50,vk52,vk53,vm40,voda,vulc,vx52,vx53,vx60,vx61,vx70,vx80,vx81,vx83,vx85,vx98,w3c ,w3c-,wap-,wapa,wapi,wapj,wapm,wapp,wapr,waps,wapt,wapu,wapv,wapy,webc,whit,wig ,winc,winw,wmlb,wonu,x700,xda-,xda2,xdag,yas-,your,zeto,zte-";
 if (trimmed_agents.indexOf(mobile_device_agent.substr(0,4)) != -1) return true;

 // Other possibilities
 var mobile_regexp = new RegExp("vx1000|lge |m800|e860|u940|ux840|compal|ahong|lg380|lgku|lgu900|lg210|lg47|lg920|lg840|lg370|sam-r|mg50|s55|g83|t66|vx400|mk99|d615|d763|el370|sl900|mp500|vx10|xda_|samu[345679]|a615|b832|m881|s920|n210|s700|c-810|_h797|mob-x|sk16d|848b|mowser|s580|r800|471x|v120|rim8|c500foma:|160x|x160|480x|x640|t503|w839|i250|sprint|w398samr810|m5252|c7100|mt126|x225|s5330|s820|htil-g1|fly v71|s302|-x113|novarra|k610i|-three|8325rc|8352rc|sanyo|vx54|c888|nx250|n120|mtk |c5588|s710|t880|c5005|i;458x|p404i|s210|c5100|teleca|s940|c500|s590|foma|samsu|vx8|vx9|a1000|_mms|myx|a700|gu1100|bc831|e300|ems100|me701|me702m-three|sd588|s800|8325rc|ac831|mw200|brew |d88|htc\/|htc_touch|355x|m50|km100|d736|p-9521|telco|sl74|ktouch|m4u\/|me702|8325rc|kddi|lg |sonyericsson|samsung|240x|x320|vx10|nokia|sony cmd|motorola|up.browser|up.link|o2");
 if (mobile_regexp.test(mobile_device_agent)) return true;

 return false;
}