(function($){

    $.fn.extend({

        insertAtCaret: function(myValue){

            var $t=$(this)[0];

            if (document.selection) {

                this.focus();

                sel = document.selection.createRange();

                sel.text = myValue;

                this.focus();

            }

            else

                if ($t.selectionStart || $t.selectionStart == '0') {

                    var startPos = $t.selectionStart;

                    var endPos = $t.selectionEnd;

                    var scrollTop = $t.scrollTop;

                    $t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length);

                    this.focus();

                    $t.selectionStart = startPos + myValue.length;

                    $t.selectionEnd = startPos + myValue.length;

                    $t.scrollTop = scrollTop;

                }

                else {

                    this.value += myValue;

                    this.focus();

                }

        }

    })  

})(jQuery);