function toggleSubCategory(n) {

	if(document.getElementById('sub'+n).style.display == 'none') {
		document.getElementById('sub'+n).style.display = '';
		document.getElementById('subSelect'+n).src = './graphics/menu/subMenuExpanded.jpg';
	} else if(document.getElementById('sub'+n).style.display == '') {
		document.getElementById('sub'+n).style.display = 'none';
		document.getElementById('subSelect'+n).src = './graphics/menu/subMenuCollapsed.jpg';
	}

}