function calibrate(option)
{
	document.getElementById('output').value="";
	setting=option;
	if (option=='full')
	{
		document.getElementById("product").innerHTML='input volume \(ft\<sup\>3\<\/sup\>\)';
		document.getElementById("amount").innerHTML='Full Cassette(s)';
		
	}
	else if (option=='half')
	{
		document.getElementById("product").innerHTML='input volume \(ft\<sup\>3\<\/sup\>\)';
		document.getElementById("amount").innerHTML='Half Cassette(s)';
	}
 
	else if (option=='free')
	{
		document.getElementById("product").innerHTML='input volume \(ft\<sup\>3\<\/sup\>\)';
		document.getElementById("amount").innerHTML='Amount of Loose Beads (lbs)';
	}
 
}
 
function calculate()
{
	
 
	if (setting=='full')
	{
		document.getElementById('output').value=Math.ceil((document.getElementById('input').value / 26));
	}
 
	else if (setting=='half')
	{
		document.getElementById('output').value=Math.ceil((document.getElementById('input').value / 13));
	}
 
	else if (setting=='free')
	{
		document.getElementById('output').value=Math.ceil((document.getElementById('input').value / 16));
	}
	else
	{
		document.getElementById("output").value='error';
	}
 
}