// JavaScript Document

function pFormCheck(form) {
	var quantity = form.quantity.value;
	if (numCheck(quantity) == false || quantity == '') {
	alert ('Fill quantity field with number bigger then 0!');
	return false;
	}
	else {
		return true;	
	}
}

function numCheckAlert(quantityTemp) {
	var RefString="1234567890";
	for (Count=0; Count < quantityTemp.length; Count++)  {
		TempChar= quantityTemp.substring (Count, Count+1);
		if (RefString.indexOf (TempChar, 0)==-1) {
			alert ('Quantity field should contain only numbers');
			return false;
		}
		if (Count==0 && TempChar == 0) {
			alert ('Quantity field should not contain number which begin with 0');
			return false;
		}
	}
}


function numCheck(quantityTemp) {
	var RefString="1234567890";
	for (Count=0; Count < quantityTemp.length; Count++)  {
		TempChar= quantityTemp.substring (Count, Count+1);
		if (RefString.indexOf (TempChar, 0)==-1) {
			return false;
		}
		if (Count==0 && TempChar == 0) {
			return false;
		}
	}
}

function selectForm(form){
	var quantity = form.quantity.value;
	var amount = form.amount.value;
	var price = form.price.value;
		
	if (quantity == '' || numCheck(quantity) == false) {
		var price = '$000';
		form.amount.value = price;
	}
	else {
		price = price * quantity;
		form.amount.value = '$' + price;
	}
}