function calculate() 
	{
		var intNumPeople = document.frmCalculator.NumberofPeople.value;
		if (intNumPeople != "")
		{
			document.getElementById('NumberOfAppetizersNeeded').innerHTML = 'You will need <strong>' + (intNumPeople * 7) + '</strong> appetizers.';
		}
		else
		{
			alert('Please enter a valid number');
			return;
		}
	}