function show1()
	{
		document.getElementById("a").style.display="block";
	}

function hide1()
	{
		document.getElementById("a").style.display="none";
	}

function show2()
	{
		document.getElementById("b").style.display="block";
	}

function hide2()
	{
		document.getElementById("b").style.display="none";
	}

function show3()
	{
		document.getElementById("c").style.display="block";
	}

function hide3()
	{
		document.getElementById("c").style.display="none";

	}

function show4()
	{
		document.getElementById("d").style.display="block";
	}

function hide4()
	{
		document.getElementById("d").style.display="none";

	}