/ / String from the left 
  String.prototype.left = function (num, mode) (if (! / \ D /. Test (num)) return (this); this.substr var str = (0, num); if (! Mode) return str ; var n = str.Tlength () - str.length; num = num - parseInt (n / 2); return this.substr (0, num);) 

  / / String from the right 
  String.prototype.right = function (num, mode) (if (! / \ D /. Test (num)) return (this); var str = this.substr (this.length-num); if (! Mode) return str; var n = str.Tlength () - str.length; num = num - parseInt (n / 2); return this.substr (this.length-num);) 

  / / String contains 
  String.prototype.GetCount = function (str, mode) (return eval ( "this.match (/ (" str ") / g" (mode? "I ":"")"). Length ");) 

  / / Empty character string ends removed 
  String.prototype.Trim = function () (return this.replace (/ (^ \ s *) | (\ s * $) / g ,"");} 
  String.prototype.Ltrim = function () (return this.replace (/ (^ \ s *) / g, "");} 
  String.prototype.Rtrim = function () (return this.replace (/ (\ s * $) / g, "");} 

  </ Script>