jQuery实现拉动页面固定顶部显示且自动消失(火狐)

<!DOCTYPE html> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>回到顶部：哭泣的小丑</title> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20src%3D%22http%3A%2F%2Fdemo.glzy8.com%2Fjslib%2Fjquery%2Fjquery-1.6.2.min.js%22%3E%3C%2Fscript%3E"> 
 
<style> 
html, body, div, span, applet, object, iframe,h1, h2, h3, h4, h5, h6, p, blockquote, pre,a, abbr, acronym, address, big, cite, code,del, dfn, em, img, ins, kbd, q, s, samp,small, strike, strong, sub, sup, tt, var,b, u, i, center,dl, dt, dd, ol, ul, li,fieldset, form, label, legend, input,table, caption, tbody, tfoot, thead, tr, th, td,article, aside, canvas, details, embed,figure, figcaption, footer, header, hgroup,menu, nav, output, ruby, section, summary,time, mark, audio, video {margin: 0;padding: 0;border: 0;font-size: 100%;} 
article, aside, details, figcaption, figure,footer, header, hgroup, menu, nav, section {display: block;float:left;}select, input, button,button img, label {vertical-align: middle;}body {font:normal 12px/1.5 "Microsoft Yahei","微软雅黑",Tahoma,Arial,Helvetica,STHeiti; webkit-font-smoothing:antialiased;-moz-font-smoothing: subpixel-antialiased; color:#666;}ol, ul {list-style: none;}blockquote, q {quotes: none;}blockquote:before, blockquote:after,q:before, q:after {content: '';content: none;}table {border-collapse: collapse;border-spacing: 0;}em {font-style: normal}select, input, button, button img, label {vertical-align:middle;}input {font-family:"Microsoft Yahei","微软雅黑";webkit-font-smoothing:antialiased;-moz-font-smoothing: subpixel-antialiased}input, input:focus, button, button:focus, select,textarea, textarea:focus {outline:none; -moz-outline:none; -webkit-outline:none; }input:focus { outline:none; -moz-outline:none; -webkit-outline:none; }textarea {resize:none;}a {color:#666; text-decoration:none;} a:hover {text-decoration:underline;}a:focus {outline:none; -moz-outline:none;-webkit-outline:none;}body {min-width: 960px;} 
</style> 
 
 
<style> 
body{background:#e7e7e7;} 
.clearfix:before, .clearfix:after, .container_24:before, .container_24:after { 
content: '.'; display: block; overflow: hidden; visibility: hidden; font-size: 0; line-height: 0; width: 0; height: 0;} 
.clearfix:after, .container_24:after { clear: both; } 
.Xc_main{width:750px;margin:0 auto;position:relative;} 
.Xc_left{float:left;} 
.Xc_left h1{font-size:24px;padding-top:25px;} 
.Xc_right{float:right;width:600px;} 
.Xc_right .Xc_list{margin:10px 0 10px 0;} 
.Xc_list_top,.Xc_list_main{background:#fff;padding:10px;border:1px solid #ccc;} 
.Xc_list_top{margin-bottom:10px;} 
.Xc_gg{width:90px;height:90px;border:1px solid #ccc;background:#fff;text-align:center;} 
.Xc_bottom{height:650px;background:#fff;padding:10px;border:1px solid #ccc;position:relative;} 
</style> 
 
</head> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%3E%20%0D%0A%24(function%20()%20%7B%20%0D%0A%24(%22.Xc_list_top%22).css(%22width%22%2C%24(%22.Xc_list_main%22).width())%3B%20%0D%0Avar%20resetRightPanelPostion%20%3D%20function%20()%20%7B%20%0D%0Avar%20msie6%20%3D%20%24.browser.msie%20%26%26%20%24.browser.version%20%3D%3D%20'6.0'%20%26%26%20%24.browser.version%20%3C%207%3B%20%0D%0Aif%20(%24.browser.safari)%20%7B%20%0D%0Abodyelem%20%3D%20%24(%22body%22)%3B%20%0D%0A%7D%20else%20%7B%20%0D%0Abodyelem%20%3D%20%24(%22html%2Cbody%22)%3B%20%0D%0A%7D%20%0D%0Avar%20bodyTop%20%3D%20bodyelem.scrollTop()%3B%20%0D%0Avar%20top%20%3D%20%24(%22.Xc_left%22).offset().top%3B%20%0D%0A%2F%2Fvar%20t%20%3D%20%24(%22%23public_footer%22).offset().top%3B%20%0D%0Avar%20t%20%3D%20%24(%22%23footerDestinationBox%22).offset().top%3B%20%0D%0A%2F%2Fvar%20bottom%20%3D%20%24(%22%23footerDestinationBox%22).offset().top%3B%20%0D%0Afor(var%20i%20%3D%200%20%3B%20i%20%3C%20%24(%22.Xc_list%20.Xc_list_top%22).length%20%3B%20i%2B%2B)%7B%20%0D%0Aif%20(bodyTop%20%3E%3D%20top%20%26%26%20((bodyTop%20%2B%20%24(%22.Xc_left%22).outerHeight())%20%3C%20t))%20%7B%20%0D%0Aif%20(!msie6)%20%7B%20%0D%0A%0D%0Aif%20(bodyTop%20%2B%20%24(%22.Xc_gg%22).outerHeight()%20%3E%3D%20t)%20%7B%20%0D%0A%24(%22.Xc_gg%22).removeClass('fixed').css(%7B%20%0D%0A%22position%22%3A%20%22absolute%22%2C%20%0D%0A%22top%22%3A%20t%20-%20%24(%22.Xc_gg%22).outerHeight()%20%2B%20%22px%22%20%0D%0A%7D)%3B%20%0D%0A%7D%20else%20%7B%20%0D%0A%24(%22.Xc_gg%22).css(%7B%20%0D%0A%22position%22%3A%20%22fixed%22%2C%20%0D%0A%22top%22%3A%200%20%0D%0A%7D)%3B%20%0D%0A%0D%0A%7D%20%0D%0A%7D%20%0D%0A%7D%20else%20%7B%20%0D%0Aif%20(!msie6)%20%7B%20%0D%0A%24(%22.Xc_gg%22).css(%7B%20%0D%0A%22position%22%3A%20%22static%22%20%0D%0A%7D)%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%0D%0Aif(bodyTop%3E%24(%22.Xc_list%22).eq(i).offset().top)%7B%20%0D%0A%24(%22.Xc_list_top%22).eq(i).css(%7Bposition%3A%22absolute%22%2Ctop%3Atop-168%7D)%3B%20%0D%0A%0D%0A%7D%20%0D%0Aif(bodyTop%3E%24(%22.Xc_list%22).eq(i).offset().top)%7B%20%0D%0A%24(%22.Xc_list_top%22).eq(i).css(%7Bposition%3A%22fixed%22%2Ctop%3A0%7D)%3B%20%0D%0A%0D%0A%7D%20%0D%0Aif(bodyTop%3C%3D%24(%22.Xc_list%22).eq(i).offset().top)%7B%20%0D%0A%24(%22.Xc_list_top%22).eq(i).css(%7Bposition%3A%22static%22%2Ctop%3A0%7D)%3B%20%0D%0A%7D%20%0D%0A%0D%0A%7D%20%0D%0A%7D%3B%20%0D%0Awindow.onload%20%3D%20function%20()%20%7B%20%0D%0Aif%20(%24(%22.Xc_gg%22).length)%20%7B%20%0D%0AresetRightPanelPostion()%3B%20%0D%0A%24(window).scroll(function%20()%20%7B%20%0D%0AresetRightPanelPostion()%3B%20%0D%0A%7D)%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%0D%0A%7D)%20%0D%0A%3C%2Fscript%3E"> 
<body> 
<div class="Xc_main clearfix"> 
<div class="clearfix" style="margin-top:90px;float:left;"> 
<div class="Xc_left"> 
<div class="Xc_gg"> 
<h1>小丑</h1> 
<div style="margin-top:40px;">Q群:<em style="color:#0069D6;">150508281</em></div> 
</div> 
</div> 
</div> 
<div class="Xc_right clearfix"> 
<div class="Xc_list"> 
<div class="Xc_list_top" id="Xc_list_top">top 1</div> 
<div class="Xc_list_main" style="height:300px;background:#fff;"> 
</div> 
</div> 
<div class="Xc_list"> 
<div class="Xc_list_top">top 2</div> 
<div class="Xc_list_main" style="height:300px;background:#fff;"> 
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<div class="Xc_list_top">top 3</div> 
<div class="Xc_list_main" style="height:300px;background:#fff;"> 
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<div class="Xc_list_top">top 4</div> 
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<div class="Xc_list_top">top 6</div> 
<div class="Xc_list_main" style="height:300px;background:#fff;"> 
</div> 
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</div> 
</div> 
<div class="Xc_bottom clearfix" id="footerDestinationBox"> 
<div style="position:absolute;top:40px;right:50px;"> by 管理资源吧 @哭泣的小丑</div> 
</div> 
</body> 
</html>

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