function plus(num) {
	var o = document.getElementById('qty-input'+num);
	o.value = parseInt(o.value);
	if (isNaN(o.value)) {
		o.value = 1;
	} else {
		o.value++;
	}
}

function minus(num) {
	var o = document.getElementById('qty-input'+num);
	o.value = parseInt(o.value);
	
	if (isNaN(o.value)) {
		o.value = 1;
	} else {
		if (o.value > 0) {
			o.value--;
		}
	}
}

function closePulldown() {
	document.getElementById('pulldown-format').getElementsByTagName('ul')[0].style.display = 'none';
	document.getElementById('pulldown-dimensions').getElementsByTagName('ul')[0].style.display = 'none';
}

function pulldown(o) {
	closePulldown();
	
	var pdo = document.getElementById('pulldown-'+o);
	pdo.getElementsByTagName('ul')[0].style.display = 'block';
}