function expandcollapse(obj,caller) {
	if (obj.style.display=='none') {
		obj.style.display='block';
		caller.setAttribute("class","collapse");
		caller.className = 'collapse';
	}
	else {
		if (obj.style.display=='block') {
			obj.style.display = 'none';
			caller.setAttribute("class","expand");
			caller.className = 'expand';
			}
	}
	return false;
}