function dochange()
	{
		if (document.getElementById("1").style.display = "block")
		{
			document.getElementById("1").style.display = "none";
			
		}
	}
	function doback(s)
	{
		if (document.getElementById(s).style.display == "block")
		{
			document.getElementById(s).style.display = "none";
			
		}
	  else if(document.getElementById(s).style.display == "none")
		{
			document.getElementById(s).style.display = "block";
		}
	}