function deleteShow()
{
	document.MyEvening.qty_tickets.value = 0;
	document.MyEvening.checkout.value='false';
	document.MyEvening.submit();
}
function checkDining(obj)
{
	if(obj.checked)
		update();
}

function submitForm()
{
	if(!isEmpty())
	{
		document.MyEvening.checkout.value = "true";
		checkout();
	}
	else
		alert('Please select your show');
}

function update()
{
	//alert('before calling update:');
	if(document.MyEvening.qty_tickets)
	{
		document.MyEvening.checkout.value='false';
		//alert('before calling checkout:');
		checkout();
		//alert('after calling checkout:');
	}
}

function checkout()
{
	if(document.MyEvening.qty_tickets)
	{
		var n = parseInt(document.MyEvening.qty_tickets.value);
		if(isNaN(n) || n <= 0)
			return alert('Please enter only number value greater than 0');
	}
	
	// Do not continue if input(s) has invalid character(s)
	if(hasInvalidCharacters(document.MyEvening))
	{
		return;
	}
	document.MyEvening.submit()	
}

var content = 0;
function isEmpty()
{
	return (content == 0)?true:false;
}