滚动条事件,当页面滚动到距顶部一定高度时某DIV自动隐藏和显示

$(function () {
//绑定滚动条事件
//绑定滚动条事件
$(window).bind("scroll", function () {
var sTop = $(window).scrollTop();
var sTop = parseInt(sTop);
if (sTop >= 130) {
if (!$("#scrollSearchDiv").is(":visible")) {
try {
$("#scrollSearchDiv").slideDown();
} catch (e) {
$("#scrollSearchDiv").show();
}
}
}
else {
if ($("#scrollSearchDiv").is(":visible")) {
try {
$("#scrollSearchDiv").slideUp();
} catch (e) {
$("#scrollSearchDiv").hide();
}
}
}
});
})