var openImg = new Image();
openImg.src = "images/arrow_up.gif";
var closedImg = new Image();
closedImg.src = "images/arrow_down.gif";

function hideOrShowDiv(section, img) {
	var objBranch = document.getElementById(section).style;
	objBranch.display = (objBranch.display == "block") ? 'none' : 'block';

	objImg = document.getElementById(img);
	objImg.src = (objImg.src.indexOf('arrow_down.gif') > -1) ? openImg.src : closedImg.src;
}

function hideOrShowDiv(section) {
	var objBranch = document.getElementById(section).style;
	objBranch.display = (objBranch.display == "block") ? 'none' : 'block';
}