function LuhnCheck(str){

  var result = true;



  var sum = 0; 

  var mul = 1; 

  var strLen = str.length;

  

  for (i = 0; i < strLen; i++){

    var digit = str.substring(strLen-i-1,strLen-i);

    var tproduct = parseInt(digit ,10)*mul;

    if (tproduct >= 10)

      sum += (tproduct % 10) + 1;

    else

      sum += tproduct;

    if (mul == 1)

      mul++;

    else

      mul--;

  }

  if ((sum % 10) != 0)

    result = false;

    

  return result;

}





function validateCCNum(cardNum){

	var result = false;

	var cardLen = cardNum.length;

	var firstdig = cardNum.substring(0,1);

	var seconddig = cardNum.substring(1,2);

	var first4digs = cardNum.substring(0,4);



	//cascade validation

	for(i=0; i<5; i++){

		switch(i){

			case 0: //"VISA":

				result = ((cardLen == 16) || (cardLen == 13)) && (firstdig == "4");

				break;

			case 1: //"AMEX":

				var validNums = "47";

				result = (cardLen == 15) && (firstdig == "3") && (validNums.indexOf(seconddig)>=0);

				break;

			case 2: //"MASTERCARD":

				var validNums = "12345";

				result = (cardLen == 16) && (firstdig == "5") && (validNums.indexOf(seconddig)>=0);

				break;

			case 3: //"DISCOVER":

				result = (cardLen == 16) && (first4digs == "6011");

				break;

			case 4: //"DINERS":

				var validNums = "068";

				result = (cardLen == 14) && (firstdig == "3") && (validNums.indexOf(seconddig)>=0);

				break;

		}

		if(result) return true;

	}

	return false;

}



function validateExpDate(expDate){

	//valid are  mmyy, mm/yy, mm20yy, mm/20yy

	var rex = /^(([0]\d{1})|([1]([012])))(\/?)(([2][0])?)(\d{2})$/;

	return rex.test(expDate);

}



function validateExpMonth(expDate){

	//valid are  01-12

	var rex = /^(([0]?\d{1})|([1]([012])))$/;

	return rex.test(expDate);

}



function validateExpYear(expDate){

	//valid are  mmyy, mm/yy, mm20yy, mm/20yy

	var rex = /^(([2][0])?)(\d{2})$/;

	return rex.test(expDate);

}





function validateCVC2(cvc2){

	//valid are ddd or dddd

	var rex = /^(\d{3,4})$/;

	return cvc2==""?true:rex.test(cvc2);

}



function validateName(name){

	var rex = /^[a-zA-Z \-\']+$/;

	return rex.test(name);

}

function CheckField(frm, fname, ftitle){

	if(frm.elements[fname].value == ""){

		alert("Please enter " + ftitle);

		frm.elements[fname].focus();

		return false;

	}

	else{

		return true;

	}

}



function CheckAddProduct(frm, min_order, max_order){

	var rex = /^(\d{1,})$/

	if(!rex.test(frm.elements["oa_quantity"].value)){

		alert("Please enter valid product quantity!\r\nIt must be a numeric value.");

		frm.elements["oa_quantity"].focus();

		return false;

	}

	if((frm.elements["oa_quantity"].value *1) < min_order){

		alert("Product quantity is less as " + min_order + " (min order quantity).\nPlease enter valid product quantity!");

		frm.elements["oa_quantity"].focus();

		return false;

	}

	if((max_order != "-") && (frm.elements["oa_quantity"].value * 1 > max_order)){

		alert("Product quantity is bigger as " + max_order + " (max order quantity).\nPlease enter valid product quantity!");

		frm.elements["oa_quantity"].focus();

		return false;

	}

	return true;

}



function CheckResetPassword(frm){

	if(!CheckField(frm, "login", "username")) return false;

	if(!isEmail(frm.elements["email"].value)){

		alert("Please enter valid email address");

		frm.elements["email"].focus();

		return false;

	}

	return true;

}



function CheckCartForm(frm){

	var irex = /^oa_quantity\[(\d{1,})\]$/;

	var drex = /^(\d{1,})$/

	for(i=0; i<frm.elements.length; i++){

		if(irex.test(frm.elements[i].name)){

			if(!drex.test(frm.elements[i].value)){

				alert("Please enter valid product quantity!\r\nIt must be a numeric value.");

				frm.elements[i].focus();

				return false;	

			}

			

			if(frm.elements[i].value * 1 < frm.elements["min_" + frm.elements[i].name].value){

				alert("Product quantity is less as " + frm.elements["min_" + frm.elements[i].name].value + " (min order quantity).\nPlease enter valid product quantity!");

				frm.elements[i].focus();

				return false;

			}

			

			if(	(frm.elements["max_" + frm.elements[i].name].value != "-") && 

			(frm.elements["max_" + frm.elements[i].name].value != "0") && 

				(frm.elements[i].value * 1 > frm.elements["max_" + frm.elements[i].name].value)

			){

				alert("Product quantity is bigger as " + frm.elements["max_" + frm.elements[i].name].value + " (max order quantity).\nPlease enter valid product quantity!");

				frm.elements[i].focus();

				return false;

			}

		}

	}

	return true;

}



function CheckNewsletters(frm){

	if(!isEmail(frm.elements["email"].value)){

		alert("Please enter valid email address");

		frm.elements["email"].focus();

		return false;

	}

	//alert(frm.elements["email_updates"]);

	if((!frm.elements["email_updates"].checked) && (!frm.elements["email_newsletters"].checked)){

		alert("Please enter choose at least one check box");

		frm.elements["email_updates"].focus();

		return false;

	}

	return true;

}



function CheckUnsubscribe(frm){

	if(!isEmail(frm.elements["email"].value)){

		alert("Please enter valid email address");

		frm.elements["email"].focus();

		return false;

	}

	//alert(frm.elements["email_updates"]);

	if((!frm.elements["email_updates"].checked) && (!frm.elements["email_newsletters"].checked)){

		alert("Please enter choose at least one check box");

		frm.elements["email_updates"].focus();

		return false;

	}

	if(confirm("Do you really want to cancel your subscribtion?")){

		return true;

	}

	return false;

}



function CheckLoginForm(frm){

	if(!CheckField(frm, "login", "your username")) return false;

	if(!CheckField(frm, "password", "your password")) return false;

	return true;

}



/////////////////////////////

// CHECK SIGNUP FORM

function CheckSignupForm(frm){

	if(!CheckField(frm, "form[fname]", "first name")) return false;

	if(!CheckField(frm, "form[lname]", "last name")) return false;

	if(!CheckField(frm, "form[address1]", "address line 1")) return false;

	if(!CheckField(frm, "form[city]", "city name")) return false;

	if(!CheckField(frm, "form[country]", "country")) return false;

	//check is there USA or Canada

	if(frm.elements["form[country]"].value == 1 || frm.elements["form[country]"].value == 2){

		//check USA state

		if(frm.elements["form[country]"].value == 1){	

			if(frm.elements["form[state]"].value < 1 || frm.elements["form[state]"].value > 50){

				alert("Please select USA state");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

		//check Canadian Province

		if(frm.elements["form[country]"].value == 2){	

			if(frm.elements["form[state]"].value < 50 || frm.elements["form[state]"].value > 63){

				alert("Please select Canadian province");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

	}

	else{

		//check custom province/state

		if(!CheckField(frm, "form[province]", "custom province/state")) return false;

	}

	

	if(!CheckField(frm, "form[zip]", "zip/postal code")) return false;

	if(!CheckField(frm, "form[phone]", "phone number")) return false;

	if(!CheckField(frm, "form[email]", "email address")) return false;

	if(!isEmail(frm.elements["form[email]"].value)){

		alert("Please enter valid email address");

		frm.elements["form[email]"].focus();

		return false;

	}

	if(!CheckField(frm, "form[login]", "username")) return false;

	if(!CheckField(frm, "form[password]", "password")) return false;

	if(!CheckField(frm, "form[password2]", "password confirmation")) return false;

	if(frm.elements["form[agree]"].checked == false){

		alert("Before registration please read our terms and conditions");

		return false;

	}

	return true;

}



function CheckShippingAddress(frm){

	if(!CheckField(frm, "form[name]", "name")) return false;

	if(!CheckField(frm, "form[address1]", "address line 1")) return false;

	if(!CheckField(frm, "form[city]", "city name")) return false;

	if(!CheckField(frm, "form[country]", "country")) return false;

	//check is there USA or Canada

	if(frm.elements["form[country]"].value == 1 || frm.elements["form[country]"].value == 2){

		//check USA state

		if(frm.elements["form[country]"].value == 1){	

			if(frm.elements["form[state]"].value < 1 || frm.elements["form[state]"].value > 50){

				alert("Please select USA state");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

		//check Canadian Province

		if(frm.elements["form[country]"].value == 2){	

			if(frm.elements["form[state]"].value < 50 || frm.elements["form[state]"].value > 63){

				alert("Please select Canadian province");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

	}

	else{

		//check custom province/state

		if(!CheckField(frm, "form[province]", "custom province/state")) return false;

	}

	if(!CheckField(frm, "form[zip]", "zip/postal code")) return false;

	return true;

}



function CheckShippingForm(frm){

	ra = document.getElementById("id_new_address_radio");

	hi = document.getElementById("id_new_address_hidden");

	if((ra && ra.checked) || hi){

		return CheckShippingAddress(frm);

	}

	return true;

}



///////////////////////////////

// CHECK BILLING FORM

function CheckBillingForm(frm){

	if(!CheckField(frm, "form[fname]", "first name")) return false;

	if(!CheckField(frm, "form[lname]", "last name")) return false;

	if(!CheckField(frm, "form[address1]", "address line 1")) return false;

	if(!CheckField(frm, "form[city]", "city name")) return false;

	//check is there USA or Canada

	if(frm.elements["form[country]"].value == 1 || frm.elements["form[country]"].value == 2){

		//check USA state

		if(frm.elements["form[country]"].value == 1){	

			if(frm.elements["form[state]"].value < 1 || frm.elements["form[state]"].value > 50){

				alert("Please select USA state");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

		//check Canadian Province

		if(frm.elements["form[country]"].value == 2){	

			if(frm.elements["form[state]"].value < 50 || frm.elements["form[state]"].value > 63){

				alert("Please select Canadian province");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

	}

	else{

		//check custom province/state

		if(!CheckField(frm, "form[province]", "custom province/state")) return false;

	}

	if(!CheckField(frm, "form[zip]", "zip/postal code")) return false;

	if(!CheckField(frm, "form[email]", "email address")) return false;

	if(!isEmail(frm.elements["form[email]"].value)){

		alert("Please enter valid email address");

		frm.elements["form[email]"].focus();

		return false;

	}

	return true;

}



///////////////////////////////

// CHECK PROFILE FORM

function CheckProfileForm(frm){

	if(!CheckField(frm, "form[fname]", "first name")) return false;

	if(!CheckField(frm, "form[lname]", "last name")) return false;

	if(!CheckField(frm, "form[address1]", "address line 1")) return false;

	if(!CheckField(frm, "form[city]", "city name")) return false;

	if(!CheckField(frm, "form[country]", "country")) return false;

	//check is there USA or Canada

	if(frm.elements["form[country]"].value == 1 || frm.elements["form[country]"].value == 2){

		//check USA state

		if(frm.elements["form[country]"].value == 1){	

			if(frm.elements["form[state]"].value < 1 || frm.elements["form[state]"].value > 50){

				alert("Please select USA state");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

		//check Canadian Province

		if(frm.elements["form[country]"].value == 2){	

			if(frm.elements["form[state]"].value < 50 || frm.elements["form[state]"].value > 63){

				alert("Please select Canadian province");

				frm.elements["form[state]"].focus();

				return false;

			}

		}

	}

	else{

		//check custom province/state

		if(!CheckField(frm, "form[province]", "custom province/state")) return false;

	}

	if(!CheckField(frm, "form[zip]", "zip/postal code")) return false;

	if(!CheckField(frm, "form[phone]", "phone number")) return false;

	if(!CheckField(frm, "form[email]", "email address")) return false;

	if(!isEmail(frm.elements["form[email]"].value)){

		alert("Please enter valid email address");

		frm.elements["form[email]"].focus();

		return false;

	}

	if(frm.elements["form[password]"].value != ""){

		if(frm.elements["form[password]"].value != frm.elements["form[password2]"].value){

			alert("Password and confirmation are different!");

			frm.elements["form[password]"].focus();

			return false;

		}

	}

	return true;

}



function CheckEmail2FriendForm(frm){

	if(!CheckField(frm, "yname", "your name")) return false;

	if(!CheckField(frm, "yemail", "your email address")) return false;

	if(!isEmail(frm.elements["yemail"].value)){

		alert("Please enter valid email address");

		frm.elements["yemail"].focus();

		return false;

	}

	if(!CheckField(frm, "fname", "your friend name")) return false;

	if(!CheckField(frm, "femail", "your friend email address")) return false;

	if(!isEmail(frm.elements["femail"].value)){

		alert("Please enter valid email address");

		frm.elements["femail"].focus();

		return false;

	}

	return true;

}