function t1()
{
	document.getElementById('t1').style.display="block";
	document.getElementById('a1').className="tabactive";
	document.getElementById('t2').style.display="none";
	document.getElementById('a2').className= "";
	document.getElementById('t3').style.display="none";
	document.getElementById('a3').className= "";
	document.getElementById('t4').style.display="none";
	document.getElementById('a4').className= "";
}
function t2()
{
	document.getElementById('t1').style.display="none";
	document.getElementById('a1').className="";
	document.getElementById('t2').style.display="block";
	document.getElementById('a2').className= "tabactive";
	document.getElementById('t3').style.display="none";
	document.getElementById('a3').className= "";
	document.getElementById('t4').style.display="none";
	document.getElementById('a4').className= "";
}
function t3()
{
	document.getElementById('t1').style.display="none";
	document.getElementById('a1').className="";
	document.getElementById('t2').style.display="none";
	document.getElementById('a2').className="";
	document.getElementById('t3').style.display="block";
	document.getElementById('a3').className="tabactive";
	document.getElementById('t4').style.display="none";
	document.getElementById('a4').className="";
}
function t4()
{
	document.getElementById('t1').style.display="none";
	document.getElementById('a1').className="";
	document.getElementById('t2').style.display="none";
	document.getElementById('a2').className="";
	document.getElementById('t3').style.display="none";
	document.getElementById('a3').className="";
	document.getElementById('t4').style.display="block";
	document.getElementById('a4').className="tabactive";
}