<SCRIPT LANGUAGE="JavaScript">
$(window).scroll(function() { // 页面发生scroll事件时触发
var bodyTop = 0;
if (typeof window.pageYOffset != 'undefined') {
bodyTop = window.pageYOffset;
} else if (typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat') {
bodyTop = document.documentElement.scrollTop;
}
else if (typeof document.body != 'undefined') {
bodyTop = document.body.scrollTop;
}
if(bodyTop > 400 && bodyTop < 800){
$("#winpop").css("top", bodyTop) // 设置层的CSS样式中的top属性, 注意要是小写，要符合“标准
}else if(bodyTop>800){
$("#winpop").css("top", 600)
}else{
$("#winpop").css("top", 230)
}
//$("#winpop").text(bodyTop); // 设置层的内容，这里只是显示当前的scrollTop
});
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
$(document).ready(function(){
var rightHeight = $("#content").height();
var aa = rightHeight-300;
//alert(aa);
});
$(window).scroll(function() { // 页面发生scroll事件时触发
var rightHeight = $("#content").height();
var aa = rightHeight-500;
//alert(rightHeight);
if(rightHeight > 800){
var bodyTop = 0;
if (typeof window.pageYOffset != 'undefined') {
bodyTop = window.pageYOffset;
} else if (typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat') {
bodyTop = document.documentElement.scrollTop;
}
else if (typeof document.body != 'undefined') {
bodyTop = document.body.scrollTop;
}
if(bodyTop > 400 && bodyTop < aa){
$("#winpop").css("top", bodyTop) // 设置层的CSS样式中的top属性, 注意要是小写，要符合“标准
}else if(bodyTop>aa){
$("#winpop").css("top", aa)
}else{
$("#winpop").css("top", 230)
}
//$("#winpop").text(bodyTop); // 设置层的内容，这里只是显示当前的scrollTop
}
});
</SCRIPT>
<div class="smid_l" id="winpop">
