<!--

var plusImage = '/agro/images/plus.gif';
var minusImage = '/agro/images/minus.gif';

function getElementById (eid)
{
	return document.getElementById (eid)
}

function switchState (div_id) 
{

	obj = getElementById (div_id);
	subtree = getElementById (div_id + 'Subtree');
	image = getElementById (div_id + 'Image');

	if (!subtree) return;

	state = subtree.style.display;

	if (state == 'block') {
		imagesrc = plusImage;
		state = 'none';
	}
	else {
		state = 'block';
		imagesrc = minusImage;
	}

	subtree.style.display = state;
	if (image) image.src = imagesrc;
}

//-->