function showBlock(i)
{
	if (i >= 1 && i <= 4)
	{
		switch(i)
		{
			case 1:
			document.getElementById('block1').style.display="block"
			break;
			
			case 2:
			document.getElementById('block2').style.display="block"
			break;
			
			case 3:
			document.getElementById('block3').style.display="block"
			break;
			
			case 4:
			document.getElementById('block4').style.display="block"
			break;
		}
	}
}

function hideAll()
{
	document.getElementById('block1').style.display="none"
	document.getElementById('block2').style.display="none"
	document.getElementById('block3').style.display="none"
	document.getElementById('block4').style.display="none"
}