function dhide()
	{
	document.getElementById('1').style.display="none";
	document.getElementById('2').style.display="none";
	document.getElementById('3').style.display="block";
	
	}
function dshow()
	{
		if(document.getElementById('1').style.display=="none" && document.getElementById('2').style.display=="none")
			{
				document.getElementById('1').style.display="block";	
				document.getElementById('2').style.display="block";
				document.getElementById('3').style.display="none";
				document.getElementById('4').style.display="block";
			}
		else
			{
				document.getElementById('1').style.display="none";
				document.getElementById('2').style.display="none";
				document.getElementById('3').style.display="block";
				document.getElementById('4').style.display="none";
			}
	}