var plusImg = new Image();
plusImg.src = "images/plusik.gif";
var minusImg = new Image();
minusImg.src = "images/minus.gif";

function showBranch(branch) 
{
	var objBranch = document.getElementById(branch).style;
	if(objBranch.display=="block")
		objBranch.display="none";
	else
		objBranch.display="block";
}
		   
function swapFolder(img) 
{
	objImg = document.getElementById(img);
	if(objImg.src.indexOf('plusik.gif')>-1)
		objImg.src = minusImg.src;
	else
		objImg.src = plusImg.src;
}