var adMaxHeight = 850;
var curtainSpeed = 20;
function HideAd(adHeight)
{
	if(adHeight > 0)
	{
		document.getElementById("advertisement").style.height = adHeight;
		setTimeout('HideAd(' + parseInt(adHeight-curtainSpeed) + ')', 2);
	}
	else
		document.getElementById("advertisement").style.display = "none";
}

function ShowAd(adHeight)
{
	if(adHeight==0)
		document.getElementById("advertisement").style.display = "block";
	if(adHeight < adMaxHeight)
	{
		document.getElementById("advertisement").style.height = adHeight;
		setTimeout('ShowAd(' + parseInt(adHeight+curtainSpeed) + ')', curtainSpeed);
	}
	//else
	//	HideAdvertisement();
}

function HideAdvertisement()
{
	setTimeout('HideAd(adMaxHeight)', 2000);
}

function ShowAdvertisement()
{
	setTimeout('ShowAd(0)', 500);
}