function a1(a)
{	
	if(a==0)
	{
		if(document.getElementById("a0").style.display == "none")
		{
			document.getElementById("a0").style.display = "";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";
		}
		else if (document.getElementById("a0").style.display == "")
		{
			document.getElementById("a0").style.display = "none";
			
		}
	}
	
	else if(a==1)
	{
		if(document.getElementById("a1").style.display == "none")
		{
			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a1").style.display == "")
		{
			document.getElementById("a1").style.display = "none";
		}
	}
	
	else if(a==2)
	{
		if(document.getElementById("a2").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a2").style.display == "")
		{
			document.getElementById("a2").style.display = "none";
		}
	}
	
	else if(a==3)
	{
		if(document.getElementById("a3").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a3").style.display == "")
		{
			document.getElementById("a3").style.display = "none";
		}
	}
	
	else if(a==4)
	{
		if(document.getElementById("a4").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a4").style.display == "")
		{
			document.getElementById("a4").style.display = "none";
		}
	}
	
	else if(a==5)
	{
		if(document.getElementById("a5").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a5").style.display == "")
		{
			document.getElementById("a5").style.display = "none";
		}
	}
	
	else if(a==6)
	{
		if(document.getElementById("a6").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "";
			document.getElementById("a7").style.display = "none";

		}
		else if (document.getElementById("a6").style.display == "")
		{
			document.getElementById("a6").style.display = "none";
		}
	}
	
	else if(a==7)
	{
		if(document.getElementById("a7").style.display == "none")
		{

			document.getElementById("a0").style.display = "none";
			document.getElementById("a1").style.display = "none";
			document.getElementById("a2").style.display = "none";
			document.getElementById("a3").style.display = "none";
			document.getElementById("a4").style.display = "none";
			document.getElementById("a5").style.display = "none";
			document.getElementById("a6").style.display = "none";
			document.getElementById("a7").style.display = "";

		}
		else if (document.getElementById("a7").style.display == "")
		{
			document.getElementById("a7").style.display = "none";
		}
	}
}