function UpdateTotal()
{
	// CREATING A VARIABLE TO HOLD THE TOTAL AMOUNT
	var totalAmount = 0;
	var hasCoupon = 0;

	// CHECK IF NEW STUDENT
	if(document.form1.newStudent[0].checked == true)
		{
			totalAmount = 20;
		}

	// APPLYING THE MULTIPLICATION
	totalAmount = totalAmount + (document.getElementById('classRate').value * document.getElementById('programLength').value);

	// CHECK COUPON
	if(document.getElementById('coupon').value.replace(/^\s*/, '').replace(/\s*$/, '') != "")
			{
			
				if(document.getElementById('classRate')[0].selected == false && document.getElementById('programLength')[0].selected == false)
			
				{
				
					// COUPON CODE 1 (10% OFF LESSON 1/2 HR. PROGRAM)
					if(document.getElementById('coupon').value.replace(/^\s*/, '').replace(/\s*$/, '') == "half hour discount")
						{
							document.getElementById('couponDescription').innerHTML = '<font color="green">10% off 1/2 hour lesson program -- A $15.50 value</font>';
							totalAmount = totalAmount - 15.50;
							document.getElementById('on0').value = document.getElementById('programLength').value + ' weeks';
							document.getElementById('os0').value = '$' + document.getElementById('classRate').value + ' per lesson. Coupon Code: half hour discount - 10% off.';
							hasCoupon = 1;
						}
			
					// COUPON CODE 2 (10% OFF LESSON HR. PROGRAM)
					else if(document.getElementById('coupon').value.replace(/^\s*/, '').replace(/\s*$/, '') == "hour discount")
						{
							document.getElementById('couponDescription').innerHTML = '<font color="green">10% off hour lesson program -- A $31.00 value</font>';
							totalAmount = totalAmount - 31.00;
							document.getElementById('on0').value = document.getElementById('programLength').value + ' weeks';
							document.getElementById('os0').value = '$' + document.getElementById('classRate').value + ' per lesson. Coupon Code: hour discount - 10% off.';
							hasCoupon = 1;
						}
		
					// COUPON CODE 3 (TRIAL LESSON)
					else if(document.getElementById('coupon').value.replace(/^\s*/, '').replace(/\s*$/, '') == "trial")
						{
							document.getElementById('couponDescription').innerHTML = '<font color="green">Trial Lesson</font>';
							totalAmount = totalAmount - 125.00;
							document.getElementById('on0').value = document.getElementById('programLength').value + '';
							document.getElementById('os0').value = '$' + document.getElementById('classRate').value + ' Coupon Code: Trial.';
							hasCoupon = 1;
						}
					else
						{
							document.getElementById('couponDescription').innerHTML = '<font color="red">Invalid code</font>';
							hasCoupon = 0;
						}
				}
			}
		
		else
			{
				document.getElementById('couponDescription').innerHTML = '&nbsp;';
			}


	// DISPLAYING THE TOTAL AMOUNT IN THE RIGHT FORM ELEMENT
	document.getElementById('tot').value = '$' + Dollar(totalAmount);

	// NOW UPDATE PAYPAL'S FORM
	document.getElementById('amount').value = Dollar(totalAmount);
	document.getElementById('on0').value = document.getElementById('programLength').value + ' weeks';

	if(hasCoupon == 0)
	{
	document.getElementById('os0').value = '$' + document.getElementById('classRate').value + ' per lesson.';
	}


}


// FORM VALIDATION
function formValidation()
{
	if(document.getElementById('classRate')[0].selected == true)
		{
			alert('Please select the Rate');
			document.getElementById('classRate').focus();
			return false
		}
	if(document.getElementById('programLength')[0].selected == true)
		{
			alert('Please select the Length');
			document.getElementById('programLength').focus();
			return false
		}
	if(document.getElementById('os1').value.replace(/^\s*/, '').replace(/\s*$/, '') == "")
		{
			alert('Please enter the student name and instrument');
			document.getElementById('os1').focus();
			return false;
		}

	// APPEND THE OPTIONS FIELD FOR THE NEW STUDENT FEE
	if(document.form1.newStudent[0].checked == true)
		{
			document.getElementById('os0').value = document.getElementById('os0').value + ' (+$20 registration fee)'
		}
	return true;
}
 

function Dollar (val)
	{
	// force to valid dollar amount
	var str,pos,rnd=0;
	  if (val < .995) rnd = 1;  // for old Netscape browsers
	  str = escape (val*1.0 + 0.005001 + rnd);  // float, round, escape
	  pos = str.indexOf (".");
	  if (pos > 0) str = str.substring (rnd, pos + 3);
	  return str;
	}