$(function() {
    $.fn.extend({
        insertAtCaret: function(myValue) {
            return this.each(function() {
                if (document.selection) { //For browsers like Internet Explorer
                    this.focus();
                    var sel = document.selection.createRange();
                    sel.text = myValue;
                    this.focus();
                } else if (this.selectionStart || this.selectionStart == '0') { //For browsers like Firefox and Webkit based
                    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();
                }
            });
        }
    });
});