var dropReady = false;
var dt = null;
var dHeight = null;
var timer = null;
var fq = 20;
function dropTopTip(){
if(!checkShow())return;
var hd = 0;
var loop = function(){
hd += 3;
if(hd >= dHeight){
dt.style.marginTop = '0';
clearInterval(timer);
dropReady = true;
}
else{
dt.style.marginTop = '-' + (dHeight - hd) + 'px';
}
};
timer = setInterval(loop,fq);
}
function hideTopTip(){
if(!dropReady)return;
if($('noTips').checked){
writeCookie('notshow',1,30);
}
var hr = 0;
var loop = function(){
hr += 3;
if(hr >= dHeight){
dt.style.marginTop = '-' + dHeight + 'px';
clearInterval(timer);
dropReady = false;
}
else{
dt.style.marginTop = '-' + hr + 'px';
}
};
timer = setInterval(loop,fq);
}

function readCookie(name)   
{   
	var cookieValue = "";   
	var search = name + "=";   
	if(document.cookie.length > 0)   
	{    
	offset = document.cookie.indexOf(search);   
	if (offset != -1)   
	{    
	 	offset += search.length;   
		end = document.cookie.indexOf(";", offset);   
		if (end == -1) end = document.cookie.length;   
			cookieValue = unescape(document.cookie.substring(offset, end))   
		}   
	}   
	return cookieValue;   
}   
         
function writeCookie(name, value, hours)
{   
	var expire = "";   
	if(hours != null)   
	{   
		expire = new Date((new Date()).getTime() + hours*3600000);   
        expire = "; expires=" + expire.toGMTString();   
    }   
    document.cookie = name + "=" + escape(value) + expire;   
}   
function delCookie(name)
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=readCookie(name);
    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}

function checkShow()//需要显示TopTip返回true
{
	if(isIE)
	{
		if(isiShowInstalled() || readCookie('notshow'))
		{
			return false;
		}
		return true;
	}else{
		return false;
	}
}

function initDrop()
{
	if(!checkShow())return;
	dt = $('toptip') ? $('toptip') : document.createElement('div');
	dt.id = 'toptip';
	dt.innerHTML = '<div id="hd"><div id="toplip"><div class="zuo">系统检测到您的电脑上未安装在线服务交易工具 <strong>秀场视频服务大厅</strong> ，请点击<a href="/software/iShow_Setup.exe"><img src="images/download_top.gif" width="65" height="18" border="0"  style="padding:2px 0px 0px 2px"/></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="checkbox" id="noTips" value="checkbox" /><label for="noTips">下次不显示</label> 关闭<a href="javascript:;"><img src="images/guanbi.gif" width="18" height="17" border="0" style="padding:0px 0px 0px 0px"/ onclick="hideTopTip()"></a></div></div>';
	document.body.insertBefore(dt,document.body.childNodes[0]);
	dHeight = dt.offsetHeight + 4;
	dt.style.marginTop = '-' + dHeight +'px';
	dropTopTip();
}

initDrop();