// JavaScript Document
function showSubNav(obj) {
	document.getElementById(obj).style.display = 'block';
}

function hideSubNav(obj) {
	document.getElementById(obj).style.display = 'none';
	 	
}



function holdSubNav(obj) {
		var nav = document.getElementById('sub-nav');
		if (obj == 'gears') {nav.style.display = 'block'}
		if (obj == 'bevel_gears') {nav.style.display = 'block'}
		if (obj == 'racks') {nav.style.display = 'block'}
		if (obj == 'helical_gears') {nav.style.display = 'block'}
		if (obj == 'sprockets') {nav.style.display = 'block'}
		if (obj == 'spur_gears') {nav.style.display = 'block'}
		if (obj == 'worm_gears_and_wheels') {nav.style.display = 'block'}
}