function showBlock(elemNum)
{

	if ($("main"+elemNum).visible()) return;
	for (var i = 1; i <= 3; i++)
	{
		if ($("main"+i).visible())
			new Effect.Fade("main"+i, {duration: 1.0}) 
	}

	var needHeight;
	
	if (1 == elemNum) needHeight = 160;
	else if (2 == elemNum) needHeight = 590;
	else if (3 == elemNum) needHeight = 350;

	setTimeout("new Effect.Morph('index_block', {style: {height: '"+needHeight+"px'}, duration: 1.0 });", 1000);
	setTimeout("new Effect.Appear('main"+elemNum+"', {duration: 1.0})", 2050);	
}