var handle;
function start() {
var obj = document.getElementById("GBookLayer");
if (parseInt(obj.style.height) == 0) {
obj.style.display = 'block';
handle = setInterval("changeH('up')", 2);
} else {
handle = setInterval("changeH('down')", 2)
}
}
function changeH(str) {
var obj = document.getElementById("GBookLayer");
if (str == "up") {
if (parseInt(obj.style.height) > 238)
clearInterval(handle);
else
obj.style.height = (parseInt(obj.style.height) + 8).toString() + "px";
}
if (str == "down") {
if (parseInt(obj.style.height) < 8) {
clearInterval(handle);
obj.style.display = "none";
}
else
obj.style.height = (parseInt(obj.style.height) - 8).toString() + "px";
}
}
var webid='1000';
var url = 'http://im.28.com.cn/Client/GBook.aspx?WebId=' + webid;
document.write('<div id="GBookLayer" style="position: absolute;right: 0px;bottom: 0px;height: 0px;width: 159px;overflow:hidden;display:none;z-index:1;"><div style="float: left; width: 139px; height: 18px; background-image: url(&quot;http://im.28.com.cn/Images/UI/3/21.jpg&quot;);" ></div><div style="float: left; width: 20px; height: 18px; background-image: url(&quot;http://im.28.com.cn/Images/UI/3/22.jpg&quot;);cursor: pointer;" onclick="javascript:start();"></div><div style="width:159px;"><iframe style="background-color: #ffffff border=0" name=LEDGER src= '+ url +' frameborder=0 width=159 height=215 ></iframe></div></div>');
document.getElementById("GBookLayer").style.height="0px";
start();
var clientHeight;
if (typeof window.pageYOffset != 'undefined') {
clientHeight = window.pageYOffset;
}
else if (typeof document.compatMode != 'undefined' &&
document.compatMode != 'BackCompat') {
clientHeight = document.documentElement.clientHeight;
}
else if (typeof document.body != 'undefined') {
clientHeight = document.body.clientHeight;
} 
var lastScrollY = 0-(clientHeight - 240);
function heartBeat1() {
var diffY;
if (typeof window.pageYOffset != 'undefined') {
diffY = window.pageYOffset;
}
else if (typeof document.compatMode != 'undefined' &&
document.compatMode != 'BackCompat') {
diffY = document.documentElement.scrollTop;
}
else if (typeof document.body != 'undefined') {
diffY = document.body.scrollTop;
} 
percent = .1 * (diffY - lastScrollY);
if (percent > 0)
percent = Math.ceil(percent);
else percent = Math.floor(percent);
document.all.GBookLayer.style.pixelTop += percent;
lastScrollY = lastScrollY + percent;
}
window.setInterval("heartBeat1()", 1);