function isblock(t,x,i)
{
		setNone(t,i);
		document.getElementById(t+x).style.display = "block";
}
function setNone(t,n)
{
	for(var i=1;i<=n;i++)
	{
		document.getElementById(t+i).style.display = "none";
	}
}
function updateClass(i)
{
	document.getElementById("cheXingClass1").className="model_03";
	document.getElementById("cheXingClass2").className="model_03";
	document.getElementById("cheXingClass3").className="model_03";
	document.getElementById("cheXingClass"+i).className="model_02";
}