【www.gdgbn.com--js教程】

<script type="text/网页特效" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script>

    我是个腼腆羞涩的浮动层...

<script>
$.fn.smartfloat = function() {
    var position = function(element) {
        var top = element.position().top, pos = element.css教程("position");
        $(window).scroll(function() {
            var scrolls = $(this).scrolltop();
            if (scrolls > top) {
                if (window.xmlhttprequest) {
                    element.css({
                        position: "fixed",
                        top: 0
                    });   
                } else {
                    element.css({
                        top: scrolls
                    });   
                }
            }else {
                element.css({
                    position: "absolute",
                    top: top
                });   
            }
        });
    };
    return $(this).each(function() {
        position($(this));                        
    });
};

//调用很简单，直接一行代码就ok了，例如下面：

$("#float").smartfloat();
</script>

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