function display_products() {
	document.getElementById('prod_opt').style.display='block';
	document.getElementById('prod_opt').style.visibility='visible';
}

function hide_products() {
	document.getElementById('prod_opt').style.display='none';
	document.getElementById('prod_opt').style.visibility='hidden';
}

function display_shop() {
	document.getElementById('shop_opt').style.display='block';
	document.getElementById('shop_opt').style.visibility='visible';
}

function hide_shop() {
	document.getElementById('shop_opt').style.display='none';
	document.getElementById('shop_opt').style.visibility='hidden';
}