function toggle(node) {
	var nextDIV = node.nextSibling;
	while(nextDIV.nodeName != "DIV") {
		nextDIV = nextDIV.nextSibling;
	}
	if (nextDIV.style.display == 'none') {
		// Change the image (if there is an image)
		if (node.childNodes.length > 0) {
			if (node.childNodes.item(0).nodeName == "IMG") {
				node.childNodes.item(0).src = getImgDirectory(node.childNodes.item(0).src) + "minus.gif";
			}
		}
		nextDIV.style.display = 'block';
	}
	// Collapse the branch if it IS visible
	else {
		// Change the image (if there is an image)
		if (node.childNodes.length > 0) {
			if (node.childNodes.item(0).nodeName == "IMG") {
  				node.childNodes.item(0).src = getImgDirectory(node.childNodes.item(0).src) + "plus.gif";
			}
		}
		nextDIV.style.display = 'none';
	}
}

function getImgDirectory(source) {
    return source.substring(0, source.lastIndexOf('/') + 1);
}