function Check()
{  
offset1 = document.cookie.indexOf("005681");

    if (offset1 == -1 )
    {
        document.getElementById("ad").style.display="";
        window.alert("请先随意点击下面一个小广告就可以看到你想要的东西了，谢谢！");
    }
    else
    {
         noad();
    }

}
function set1() {
    var expireDate = new Date();
    var hours = expireDate.getHours();
    var minutes = expireDate.getMinutes();
    var seconds = expireDate.getSeconds();
    var lefttime = 1000 * 600;
    expireDate.setTime (expireDate.getTime() + lefttime);
    document.cookie = "005681=yes" + "; expires=" + expireDate.toGMTString() +  ";";
}
function ad()//点击广告前
{
	document.getElementById("AD1").style.display="";
	//document.getElementById("AD2").style.display="";
	document.getElementById("NOAD1").style.display="none";
	//document.getElementById("NOAD2").style.display="none";
}
function noad()//点击广告后
{
	document.getElementById("AD1").style.display="none";
	//document.getElementById("AD2").style.display="none";
	document.getElementById("NOAD1").style.display="";
	//document.getElementById("NOAD2").style.display="";
}
function first()//显示页面时
{
	offset1 = document.cookie.indexOf("005681");

	//window.alert(offset1);
    if (offset1 == -1 )//未点击广告
    {
        ad();
    }
    else//已点击广告
    {
        noad();
    }

}