auto select timezone with javascript in rails

gistfile1.txt

.sign_up_in_content
  = simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name)) 
  = simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f|
    %span
      = f.input :email, :input_html => {:placeholder => 'Email'}
    %span
      = f.input :password, :input_html => {:placeholder => 'Password'}
    %span
      = f.input :time_zone, :priority => /US/
    = f.button :submit, 'Submit'

:javascript
  $(function(){
    $("#user_time_zone").set_timezone()
  })







#jsTimezoneDetect.min.js
var jstz=function(){var b=function(a){a=-a.getTimezoneOffset();return null!==a?a:0},c=function(){return b(new Date(2010,0,1,0,0,0,0))},f=function(){return b(new Date(2010,5,1,0,0,0,0))},e=function(){var a=c(),d=f(),b=c()-f();return new jstz.TimeZone(jstz.olson.timezones[0>b?a+",1":0<b?d+",1,s":a+",0"])};return{determine_timezone:function(){"undefined"!==typeof console&&console.log("jstz.determine_timezone() is deprecated and will be removed in an upcoming version. Please use jstz.determine() instead.");
return e()},determine:e,date_is_dst:function(a){var d=5<a.getMonth()?f():c(),a=b(a);return 0!==d-a}}}();jstz.TimeZone=function(b){var c=null,c=b;"undefined"!==typeof jstz.olson.ambiguity_list[c]&&function(){for(var b=jstz.olson.ambiguity_list[c],e=b.length,a=0,d=b[0];a<e;a+=1)if(d=b[a],jstz.date_is_dst(jstz.olson.dst_start_dates[d])){c=d;break}}();return{name:function(){return c}}};jstz.olson={};
jstz.olson.timezones={"-720,0":"Etc/GMT+12","-660,0":"Pacific/Pago_Pago","-600,1":"America/Adak","-600,0":"Pacific/Honolulu","-570,0":"Pacific/Marquesas","-540,0":"Pacific/Gambier","-540,1":"America/Anchorage","-480,1":"Pacific Time (US & Canada)","-480,0":"Pacific/Pitcairn","-420,0":"Mountain Time (US & Canada)","-420,1":"Mountain Time (US & Canada)","-360,0":"America/Guatemala","-360,1":"Central Time (US & Canada)","-360,1,s":"Pacific/Easter","-300,0":"America/Bogota","-300,1":"Eastern Time (US & Canada)","-270,0":"America/Caracas","-240,1":"America/Halifax",
"-240,0":"America/Santo_Domingo","-240,1,s":"America/Asuncion","-210,1":"America/St_Johns","-180,1":"America/Godthab","-180,0":"America/Argentina/Buenos_Aires","-180,1,s":"America/Montevideo","-120,0":"America/Noronha","-120,1":"Etc/GMT+2","-60,1":"Atlantic/Azores","-60,0":"Atlantic/Cape_Verde","0,0":"Etc/UTC","0,1":"Europe/London","60,1":"Europe/Berlin","60,0":"Africa/Lagos","60,1,s":"Africa/Windhoek","120,1":"Asia/Beirut","120,0":"Africa/Johannesburg","180,1":"Europe/Moscow","180,0":"Asia/Baghdad",
"210,1":"Asia/Tehran","240,0":"Asia/Dubai","240,1":"Asia/Yerevan","270,0":"Asia/Kabul","300,1":"Asia/Yekaterinburg","300,0":"Asia/Karachi","330,0":"Asia/Kolkata","345,0":"Asia/Kathmandu","360,0":"Asia/Dhaka","360,1":"Asia/Omsk","390,0":"Asia/Rangoon","420,1":"Asia/Krasnoyarsk","420,0":"Asia/Jakarta","480,0":"Asia/Shanghai","480,1":"Asia/Irkutsk","525,0":"Australia/Eucla","525,1,s":"Australia/Eucla","540,1":"Asia/Yakutsk","540,0":"Asia/Tokyo","570,0":"Australia/Darwin","570,1,s":"Australia/Adelaide",
"600,0":"Australia/Brisbane","600,1":"Asia/Vladivostok","600,1,s":"Australia/Sydney","630,1,s":"Australia/Lord_Howe","660,1":"Asia/Kamchatka","660,0":"Pacific/Noumea","690,0":"Pacific/Norfolk","720,1,s":"Pacific/Auckland","720,0":"Pacific/Tarawa","765,1,s":"Pacific/Chatham","780,0":"Pacific/Tongatapu","780,1,s":"Pacific/Apia","840,0":"Pacific/Kiritimati"};
jstz.olson.dst_start_dates={"America/Denver":new Date(2011,2,13,3,0,0,0),"America/Mazatlan":new Date(2011,3,3,3,0,0,0),"America/Chicago":new Date(2011,2,13,3,0,0,0),"America/Mexico_City":new Date(2011,3,3,3,0,0,0),"Atlantic/Stanley":new Date(2011,8,4,7,0,0,0),"America/Asuncion":new Date(2011,9,2,3,0,0,0),"America/Santiago":new Date(2011,9,9,3,0,0,0),"America/Campo_Grande":new Date(2011,9,16,5,0,0,0),"America/Montevideo":new Date(2011,9,2,3,0,0,0),"America/Sao_Paulo":new Date(2011,9,16,5,0,0,0),"America/Los_Angeles":new Date(2011,
2,13,8,0,0,0),"America/Santa_Isabel":new Date(2011,3,5,8,0,0,0),"America/Havana":new Date(2011,2,13,2,0,0,0),"America/New_York":new Date(2011,2,13,7,0,0,0),"Asia/Gaza":new Date(2011,2,26,23,0,0,0),"Asia/Beirut":new Date(2011,2,27,1,0,0,0),"Europe/Minsk":new Date(2011,2,27,2,0,0,0),"Europe/Helsinki":new Date(2011,2,27,4,0,0,0),"Europe/Istanbul":new Date(2011,2,28,5,0,0,0),"Asia/Damascus":new Date(2011,3,1,2,0,0,0),"Asia/Jerusalem":new Date(2011,3,1,6,0,0,0),"Africa/Cairo":new Date(2010,3,30,4,0,0,
0),"Asia/Yerevan":new Date(2011,2,27,4,0,0,0),"Asia/Baku":new Date(2011,2,27,8,0,0,0),"Pacific/Auckland":new Date(2011,8,26,7,0,0,0),"Pacific/Fiji":new Date(2010,11,29,23,0,0,0),"America/Halifax":new Date(2011,2,13,6,0,0,0),"America/Goose_Bay":new Date(2011,2,13,2,1,0,0),"America/Miquelon":new Date(2011,2,13,5,0,0,0),"America/Godthab":new Date(2011,2,27,1,0,0,0)};
jstz.olson.ambiguity_list={"America/Denver":["America/Denver","America/Mazatlan"],"America/Chicago":["America/Chicago","America/Mexico_City"],"America/Asuncion":["Atlantic/Stanley","America/Asuncion","America/Santiago","America/Campo_Grande"],"America/Montevideo":["America/Montevideo","America/Sao_Paulo"],"Asia/Beirut":"Asia/Gaza Asia/Beirut Europe/Minsk Europe/Helsinki Europe/Istanbul Asia/Damascus Asia/Jerusalem Africa/Cairo".split(" "),"Asia/Yerevan":["Asia/Yerevan","Asia/Baku"],"Pacific/Auckland":["Pacific/Auckland",
"Pacific/Fiji"],"America/Los_Angeles":["America/Los_Angeles","America/Santa_Isabel"],"America/New_York":["America/Havana","America/New_York"],"America/Halifax":["America/Goose_Bay","America/Halifax"],"America/Godthab":["America/Miquelon","America/Godthab"]};