var Sum = 200; // The Initial amount  //
var Amt = 0;
var Index = 0;

function calculateTotal() // This function is called when the Quantity is changed //
{
	Q = document.form1.qty.selectedIndex+1;
	Amt = Sum*Q;
	
	document.getElementById('BasicPrice').innerHTML = Sum;
	document.getElementById('OrderQuantity').innerHTML = Q;
	document.getElementById('OrderTotal').innerHTML = Amt;

	document.forms.form1.PricePerModel.value = Sum;
	document.forms.form1.hdnQuantity.value = Q;
}