JS read/write cookie

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Function setcookie (name, value) {var days = 30; // This cookie will be saved for 30 days var exp = new date (); exp. settime (exp. gettime () + days * 24x60*60*1000); document. cookie = Name + "=" + escape (value) + "; expires =" + exp. togmtstring ();} function getcookie (name) {var arr = document. cookie. match (New Regexp ("(^ |)" + name + "= ([^;] *) (; | $)"); If (Arr! = NULL) return Unescape (ARR [2]); Return "ext-all.css";} function delcookie (name) {var exp = new date (); exp. settime (exp. gettime ()-1); var cval = getcookie (name); If (cval! = NULL) document. Cookie = Name + "=" + cval + "; expires =" + exp. togmtstring ();}