function forSale(num) {
	if (num==12 || num==13 || num==20) {
		return false;
	}
	else {
		return true;
	}
}

function abstract_updateSizes () {
	var url = String(current.attr('src'));
	var backslash = url.lastIndexOf('/');
	var number = (current.attr('src').substr(backslash+1,2))*1;
	populateSizes(number);
}

function populateSizes(num) {
	switch (num) {
		case 1: canon(); break;
		case 2: canon(); break;
		case 3: canon(); break;
		case 4: canon(); break;
		case 5: sony(); break;
		case 6: sony(); break;
		case 7: canon(); break;
		case 8: canon(); break;
		case 9: canon(); break;
		case 10: canon(); break;
		case 11: canon(); break;
		case 12: canon(); break;
		case 13: canon(); break;
		case 14: sony(); break;
		case 15: sony(); break;
		case 16: sony(); break;
		case 17: square(); break;
		case 18: sony(); break;
		case 19: sony(); break;
		case 20: sony(); break;
		case 21: sony(); break;
		case 22: canon(); break;
		case 23: canon(); break;
		case 24: canon(); break;
		case 25: canon(); break;
		case 26: canon(); break;
	}
}