jQuery.fn.autoGrow = function () {
  return this.each(function () {
    // Variables
    var colsDefault = this.cols;
    var rowsDefault = this.rows;

    //Functions
    var grow = function () {
      growByRef(this);
    }

    var growByRef = function (obj) {
      var linesCount = 0;
      var lines = obj.value.split('\n');

      for (var i = lines.length - 1; i >= 0; --i) {
        linesCount += Math.floor((lines[i].length / colsDefault) + 1);
      }

      if (linesCount >= rowsDefault)
        obj.rows = linesCount + 1;
      else
        obj.rows = rowsDefault;
    }

    var characterWidth = function (obj) {
      var characterWidth = 0;
      var temp1 = 0;
      var temp2 = 0;
      var tempCols = obj.cols;

      obj.cols = 1;
      temp1 = obj.offsetWidth;
      obj.cols = 2;
      temp2 = obj.offsetWidth;
      characterWidth = temp2 - temp1;
      obj.cols = tempCols;

      return characterWidth;
    }

    // Manipulations
    this.style.width = "auto";
    this.style.height = "auto";
    this.style.overflow = "hidden";
    this.style.width = ((characterWidth(this) * this.cols) + 6) + "px";
    this.onkeyup = grow;
    this.onfocus = grow;
    this.onblur = grow;
    growByRef(this);
  });
};