var objImagePlus = new Image();
objImagePlus.src = "/images/tree_plus.gif";
var objImageMinus = new Image();
objImageMinus.src = "/images/tree_minus.gif";

function doShowHideBranch(branchID)
{
	if(document.getElementById(branchID))
	{
		var objBranch = document.getElementById(branchID);	
																									
		if(objBranch.style.display == "") objBranch.style.display = "block";
																	
		if(objBranch.style.display == "block") objBranch.style.display = "none";
		else objBranch.style.display = "block";
	}		
}

function doPlusMinusNodeImage(imgPlusMinusNodeID)
{
	objNodeImg = document.getElementById(imgPlusMinusNodeID);
	if(objNodeImg.src.indexOf('plus')>-1) objNodeImg.src = objImageMinus.src;
	else objNodeImg.src = objImagePlus.src;
}