(function ($) {
    $.fn.floatad = function (options) {
        var defaults = { imgsrc: "", url: "", openstyle: 1, speed: 10 };
        var options = $.extend(defaults, options);
        var _target = options.openstyle == 1 ? "target='_blank'" : '';
        var html = "<div id='float_ad' style='position:fixed;left:0px;top:0px;z-index:1000000;cleat:both;'>";
        html += "<div id='float_colse' style='position:absolute;right:0px;top:0px;z-index:2000000; font-size:28px; border:solid 1px #ccc; border-radius:50%; line-height:20px; text-align:center; color:#ccc; height:28px; width:28px;cursor:pointer;'>×</div>";
        html += "  <a href='" + options.url + "' " + _target + "><img src='" + options.imgsrc + "' border='0' class='float_ad_img' width='300px' /></a>";
        html += "</div>";
        $('body').append(html);
        function init() {
            var x = 0, y = 0;
            var xin = true, yin = true;
            var step = 1;
            var delay = 10;
            var obj = $("#float_ad");
            obj.find('img.float_ad_img').on('load', function () {
                var float = function () {
                    var l = t = 0;
                    var ow = obj.width();
                    var oh = obj.height();
                    var dw = $(window).width();
                    var dh = $(window).height();

                    x = x + step * (xin ? 1 : -1);
                    if (x < l) { xin = true; x = l }
                    if (x > dw - ow - 1) { xin = false; x = dw - ow - 1 }

                    y = y + step * (yin ? 1 : -1);
                    if (y > dh - oh - 1) { yin = false; y = dh - oh - 1 }
                    if (y < t) { yin = true; y = t }

                    var left = x;
                    var top = y;

                    obj.css({ 'top': top, 'left': left })
                };
                var itl = setinterval(float, options.speed);
                $('#float_ad').mouseover(function () {
                    clearinterval(itl)
                });
                $('#float_ad').mouseout(function () {
                    itl = setinterval(float, options.speed)
                })
                $('#float_colse').click(function () {
                    clearinterval(itl);
                    $('#float_ad').hide();
                })
            })
        }
        init()
    }
})(jquery);