<!--
function qp_changeUnit(){
if(document.getElementById("qp_width_inches").checked)
{
document.qpForm.width_fraction.style.visibility = "visible";
}
else
{
document.qpForm.width_fraction.style.visibility = "hidden";
document.qpForm.width_fraction.selectedIndex = 0;
}
if(document.getElementById("qp_drop_inches").checked)
{
document.qpForm.drop_fraction.style.visibility = "visible";
}
else
{
document.qpForm.drop_fraction.style.visibility = "hidden";
document.qpForm.drop_fraction.selectedIndex = 0;
}
}

function qp_checkForm()
{
	qp_changeUnit();
	if(document.qpForm.width.value == "")
		alert('You must enter a width.');
	else if(isPosInt(document.qpForm.width.value) == false)
		alert('You must enter a valid width (no decimals).');
	else if(document.qpForm.drop.value == "")
		alert('You must enter a drop.');
	else if(isPosInt(document.qpForm.drop.value) == false)
		alert('You must enter a valid drop (no decimals).');
	else
		return true;
		
	return false;
}

function isPosInt(s)
{
	for(i = 0; i < s.length; i++)
	{
		var code = s.charCodeAt(i);
		if(code < 48 || code > 57)
			return false;
	}
}
-->