var last_obj_displayed = '';
var last_button = '';
function showHide(id1, id2)
	{	
		var last_obj = document.getElementById("pane0");
			last_obj.style.display ="none";
			
		
		
		if (last_obj_displayed != '') 
			{
			var last_obj = document.getElementById(last_obj_displayed);
			last_obj.style.display ="none";
			document.getElementById(last_button).className = "buttons";
			}
			
		retreat("buttons3")
		document.getElementById(id2).className = "buttons2";
		var obj1 = document.getElementById(id1);
		obj1.style.display="block";
		
		last_obj_displayed = id1;
		last_button= id2;
			
	}
	
	function goback()
	{	
		var last_obj = document.getElementById(last_obj_displayed);
			last_obj.style.display ="none";
		var last_obj = document.getElementById("pane0");
			last_obj.style.display ="block";
		retreat("buttons")
			
	}
	
	function retreat(id3)
	{	
		document.getElementById("button1").className = id3;
		document.getElementById("button2").className = id3;
		document.getElementById("button3").className = id3;
		document.getElementById("button4").className = id3;
		document.getElementById("button5").className = id3;
		document.getElementById("button6").className = id3;
			
	}