plus = new Image;
plus.src = "tng_plus.gif";
minus = new Image;
minus.src = "tng_minus.gif";

function swap(x, y) {
	document.images[x].src=eval(y+'.src');
}

function toggleRoger( section, section2 ) {
	var section_ul = document.getElementById(section);
	var section_text = document.getElementById(section2);

	if( section_ul.style.display == 'none' ) {
		section_ul.style.display = '';
		section_text.style.display = 'none';
		swap(section + "plus","minus");
	}
	else {
		section_ul.style.display = 'none';
		swap(section + "plus","plus");
		section_text.style.display = '';
	}

	return false;
}