function calc_size() {
	if (document.calculator.square.checked)
	{
		var size = (document.calculator.diameter.value / 2);
		var size = Math.round(document.calculator.diameter.value * document.calculator.length.value * document.calculator.height.value * 219.96925);
		document.calculator.size.value= (size + " gallons");
	}
	else
	{		
		var size = (document.calculator.diameter.value / 2);
		size = Math.round(size * size * 3.14159 * document.calculator.height.value * 219.96925);
		document.calculator.size.value= (size + " gallons");
	}
}

function square_click() {
	document.calculator.reset();
	document.calculator.square.checked = true;
	document.getElementById('lblDiameter').innerText = "Width (m):";
	document.calculator.round.checked = false;
	document.getElementById('rowLength').style.display = '';
}

function round_click() {
	document.calculator.reset();
	document.getElementById('lblDiameter').innerText = "Diameter (m):";
	document.getElementById('rowLength').style.display = 'none';
}