(function ($) {
        var pasteEventName = ($.browser.msie ? 'paste' : 'input') + ".mask";
        var iPhone = (window.orientation != undefined);

        $.mask = {
            //Predefined character definitions
            definitions: {
                '9': "[0-9]",
                'a': "[A-Za-z]",
                '*': "[A-Za-z0-9]"
            },
            dataName: "rawMaskFn"
        };

        $.fn.extend({
            //Helper Function for Caret positioning
            caret: function (begin, end) {
                if (this.length == 0) return;
                if (typeof begin == 'number') {
                    end = (typeof end == 'number') ? end : begin;
                    return this.each(function () {
                        if (this.setSelectionRange) {
                            this.setSelectionRange(begin, end);
                        } else if (this.createTextRange) {
                            var range = this.createTextRange();
                            range.collapse(true);
                            range.moveEnd('character', end);
                            range.moveStart('character', begin);
                            range.select();
                        }
                    });
                } else {
                    if (this[0].setSelectionRange) {
                        begin = this[0].selectionStart;
                        end = this[0].selectionEnd;
                    } else if (document.selection && document.selection.createRange) {
                        var range = document.selection.createRange();
                        begin = 0 - range.duplicate().moveStart('character', -100000);
                        end = begin + range.text.length;
                    }
                    return { begin: begin, end: end };
                }
            },
            unmask: function () { return this.trigger("unmask"); },
            mask: function (mask, settings) {
                if (!mask && this.length > 0) {
                    var input = $(this[0]);
                    return input.data($.mask.dataName)();
                }
                settings = $.extend({
                    placeholder: "_",
                    completed: null
                }, settings);

                var defs = $.mask.definitions;
                var tests = [];
                var partialPosition = mask.length;
                var firstNonMaskPos = null;
                var len = mask.length;

                $.each(mask.split(""), function (i, c) {
                    if (c == '?') {
                        len--;
                        partialPosition = i;
                    } else if (defs[c]) {
                        tests.push(new RegExp(defs[c]));
                        if (firstNonMaskPos == null)
                            firstNonMaskPos = tests.length - 1;
                    } else {
                        tests.push(null);
                    }
                });

                return this.trigger("unmask").each(function () {
                    var input = $(this);
                    var buffer = $.map(mask.split(""), function (c, i) { if (c != '?') return defs[c] ? settings.placeholder : c });
                    var focusText = input.val();

                    function seekNext(pos) {
                        while (++pos <= len && !tests[pos]);
                        return pos;
                    };
                    function seekPrev(pos) {
                        while (--pos >= 0 && !tests[pos]);
                        return pos;
                    };

                    function shiftL(begin, end) {
                        if (begin < 0)
                            return;
                        for (var i = begin, j = seekNext(end); i < len; i++) {
                            if (tests[i]) {
                                if (j < len && tests[i].test(buffer[j])) {
                                    buffer[i] = buffer[j];
                                    buffer[j] = settings.placeholder;
                                } else
                                    break;
                                j = seekNext(j);
                            }
                        }
                        writeBuffer();
                        input.caret(Math.max(firstNonMaskPos, begin));
                    };

                    function shiftR(pos) {
                        for (var i = pos, c = settings.placeholder; i < len; i++) {
                            if (tests[i]) {
                                var j = seekNext(i);
                                var t = buffer[i];
                                buffer[i] = c;
                                if (j < len && tests[j].test(t))
                                    c = t;
                                else
                                    break;
                            }
                        }
                    };

                    function keydownEvent(e) {
                        var k = e.which;

                        //backspace, delete, and escape get special treatment
                        if (k == 8 || k == 46 || (iPhone && k == 127)) {
                            var pos = input.caret(),
							begin = pos.begin,
							end = pos.end;

                            if (end - begin == 0) {
                                begin = k != 46 ? seekPrev(begin) : (end = seekNext(begin - 1));
                                end = k == 46 ? seekNext(end) : end;
                            }
                            clearBuffer(begin, end);
                            shiftL(begin, end - 1);

                            return false;
                        } else if (k == 27) {//escape
                            input.val(focusText);
                            input.caret(0, checkVal());
                            return false;
                        }
                    };

                    function keypressEvent(e) {
                        var k = e.which,
						pos = input.caret();
                        if (e.ctrlKey || e.altKey || e.metaKey || k < 32) {//Ignore
                            return true;
                        } else if (k) {
                            if (pos.end - pos.begin != 0) {
                                clearBuffer(pos.begin, pos.end);
                                shiftL(pos.begin, pos.end - 1);
                            }

                            var p = seekNext(pos.begin - 1);
                            if (p < len) {
                                var c = String.fromCharCode(k);
                                if (tests[p].test(c)) {
                                    shiftR(p);
                                    buffer[p] = c;
                                    writeBuffer();
                                    var next = seekNext(p);
                                    input.caret(next);
                                    if (settings.completed && next >= len)
                                        settings.completed.call(input);
                                }
                            }
                            return false;
                        }
                    };

                    function clearBuffer(start, end) {
                        for (var i = start; i < end && i < len; i++) {
                            if (tests[i])
                                buffer[i] = settings.placeholder;
                        }
                    };

                    function writeBuffer() { return input.val(buffer.join('')).val(); };

                    function checkVal(allow) {
                        //try to place characters where they belong
                        var test = input.val();
                        var lastMatch = -1;
                        for (var i = 0, pos = 0; i < len; i++) {
                            if (tests[i]) {
                                buffer[i] = settings.placeholder;
                                while (pos++ < test.length) {
                                    var c = test.charAt(pos - 1);
                                    if (tests[i].test(c)) {
                                        buffer[i] = c;
                                        lastMatch = i;
                                        break;
                                    }
                                }
                                if (pos > test.length)
                                    break;
                            } else if (buffer[i] == test.charAt(pos) && i != partialPosition) {
                                pos++;
                                lastMatch = i;
                            }
                        }
                        if (!allow && lastMatch + 1 < partialPosition) {
                            //input.val("");
                            //clearBuffer(0, len);
                        } else if (allow || lastMatch + 1 >= partialPosition) {
                            writeBuffer();
                            if (!allow) input.val(input.val().substring(0, lastMatch + 1));
                        }
                        return (partialPosition ? i : firstNonMaskPos);
                    };

                    input.data($.mask.dataName, function () {
                        return $.map(buffer, function (c, i) {
                            return tests[i] && c != settings.placeholder ? c : null;
                        }).join('');
                    })

                    if (!input.attr("readonly"))
                        input
					.one("unmask", function () {
					    input
							.unbind(".mask")
							.removeData($.mask.dataName);
					})
					.bind("focus.mask", function () {
					    focusText = input.val();
					    var pos = checkVal();
					    writeBuffer();
					    var moveCaret = function () {
					        if (pos == mask.length)
					            input.caret(0, pos);
					        else
					            input.caret(pos);
					    };
					    ($.browser.msie ? moveCaret : function () { setTimeout(moveCaret, 0) })();
					})
					.bind("blur.mask", function () {
					    checkVal();
					    if (input.val() != focusText)
					        input.change();
					})
					.bind("keydown.mask", keydownEvent)
					.bind("keypress.mask", keypressEvent)
					.bind(pasteEventName, function () {
					    setTimeout(function () { input.caret(checkVal(true)); }, 0);
					});

                    checkVal(); //Perform initial check for existing values
                });
            }
        });
    })(jQuery);