var openImg = new Image();
openImg.src = "tree/open.gif";
var closedImg = new Image();
closedImg.src = "tree/closed.gif";
var firstBranch;
var branchname;
var openheader;

function showBranch(branch){
	var objBranch = document.getElementById(branch).style;
	
	if(objBranch.display=="block")
		objBranch.display="none";
	else
		objBranch.display="block";
	swapFolder('I' + branch);

	checkFirstBranch(firstBranch,branch);
	firstBranch=branch;
	
}

function swapFolder(img){
	objImg = document.getElementById(img);
	if(objImg.src.indexOf('closed.gif')>-1)
		objImg.src = openImg.src;
	else
		objImg.src = closedImg.src;
}

function checkFirstBranch(firstBranch,branch){
	
	if(firstBranch!=null)
	{

		var header=firstBranch.substring(0,1);
			if(header=='H')
				openheader=firstBranch;
		//alert(openheader);
		var header1=openheader.substring(0,1);
		var header2=branch.substring(0,1);
		//alert(header1+ '  '+header2);
		if(header !='H' ) 
		{
			var objBranch = document.getElementById(firstBranch).style;
			//alert(objBranch);
			if(objBranch.display=="block")
				objBranch.display="none";
			else
				objBranch.display="block";
			swapFolder('I' + firstBranch);
		}
 		if(header1 == header2) 
		{
			//alert(openheader);
			var objBranch = document.getElementById(openheader).style;
			//alert(objBranch);
			if(objBranch.display=="block")
				objBranch.display="none";
			else
				objBranch.display="block";
			swapFolder('I' + openheader);
		}
		

		
		
	}
}