var prices = new Array();
prices[0] = '85';
prices[1] = '65';
prices[2] = '50';
prices[3] = '20';
prices[4] = '10';
prices[5] = '15';
prices[6] = '12';
prices[7] = '15';
prices[8] = '12';

function calculate() {
	total = 0;
	for (i = 0; i < prices.length; i++) {
	try {
		q = document.getElementById('product' + i).value;
		total += q*prices[i];
		} catch(e) {}
	}
	document.getElementById("total").value = total;
}

function validate() {
	if (!document.getElementById('fname').value || !document.getElementById('lname').value || !document.getElementById('address').value || !document.getElementById('city').value || !document.getElementById('country').value || !document.getElementById('cp').value || !document.getElementById('email').value || !document.getElementById('tel').value) 
	{
		alert('All fields are mandatory');
		return false;
	}
	return true;
}