function setVisible(obj)
{
	obj = document.getElementById(obj);
	obj.style.visibility = (obj.style.visibility == 'hidden') ? 'visible' : 'hidden';
}

function changeAdvert(obj)
{
	showAdvert(obj);
	if(obj == 'advert1')
		hideAdvert('advert2');
	if(obj == 'advert2')
		hideAdvert('advert1');
	hideDiv();
}

function showAdvert(obj)
{
	adv = document.getElementById(obj);
	adv.style.width = '600px';
	adv.style.height = '490px';
	adv.style.left = '300px';
	adv.style.top = '170px';
	adv.style.visibility = (adv.style.visibility == 'hidden') ? 'visible' : 'hidden';
}

function hideAdvert(obj)
{
	adv = document.getElementById(obj);
	adv.style.left = '-10000px';
	adv.style.right = '-10000px';
	adv.style.width = '0px';
	adv.style.height = '0px';
}

function showDiv()
{
	div = document.getElementById('div');
	div.style.left = '600px';
	div.style.top = '160px';
	div.style.width = '300px';
	div.style.height = '120px';
}

function hideDiv()
{
	div = document.getElementById('div');
	div.style.left = '-10000px';
	div.style.top = '-10000px';
	div.style.width = '0px';
	div.style.height = '0px';
}