function toggle(elementID, imageID)
{
	var objElement = document.getElementById(elementID);
	var image =  document.getElementById(imageID);
	if (objElement.style.display == 'none')
	{
		objElement.style.display = '';
		image.src = 'minus.gif';
	}
	else
	{
		objElement.style.display = 'none';
		image.src = 'plus.gif';
	}

}