function data_check() 
{
	if(document.getElementById('check_data').checked == true)
	{
		document.getElementById('sub_data').style.display = 'block';
	}
	else
	{
		document.getElementById('sub_data').style.display = 'none';
	}
}

function switch_(on, off) 
{
	document.getElementById(on).style.display = 'block';
	document.getElementById(off).style.display = 'none';
}