$.fn.extend({
    insertAtCaret: function(myValue)
    {
      return this.each(function() {
        if (document.selection)
        {
          this.focus();
          sel = document.selection.createRange();
          sel.text = myValue;
          this.focus();
        } else if (this.selectionStart || this.selectionStart == '0')
        {
          var startPos = this.selectionStart;
          var endPos = this.selectionEnd;
          var scrollTop = this.scrollTop;
          this.value = this.value.substring(0, startPos) + myValue + this.value.substring(endPos,this.value.length);
          this.focus();
          this.selectionStart = startPos + myValue.length;
          this.selectionEnd = startPos + myValue.length;
          this.scrollTop = scrollTop;
        } else {
          this.value += myValue;
          this.focus();
        }


      });
    }
})