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 first2digs = cardNum.substring(0,2);

	var first3digs = cardNum.substring(0,3);

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

	

	

	//cascade validation

	//source: http://en.wikipedia.org/wiki/Credit_card_number

	for(i=0; i<9; i++){

		switch(i){

			case 0: //American Express 34 and 37 15 

				result = (cardLen == 15) && ((first2digs == "34") || (first2digs == "37"));

				break;

			case 1: //Bankcard 560–561 16 

				result = (cardLen == 16) && ((first3digs == "560") || (first3digs == "561"));

				break;

			case 2: //Diners Club International[1] 36 15 

				result = (cardLen == 15) && (first2digs == "36");

				break;

			case 3: //Diners Club US & Canada[1] 55 16 

				result = (cardLen == 16) && (first2digs == "55");

				break;

			

			//As of October 1st, 2005, Discover Bank will include a new BIN in the range of 650000–650999.

			case 4: //Discover Card 6011 and 650* 16 

				result = (cardLen == 16) && ((first3digs == "650") || (first4digs == "6011"));

				break;

			case 5: //JCB 3 16 

				result = (cardLen == 16) && (firstdig == "3");

				break;

			case 6: //JCB 1800 and 2131 15 

				result = (cardLen == 15) && ((first4digs == "1800") || (first4digs == "2131"));

				break;

				

			//As of November 8, 2004, MasterCard purchased the domestic (US) Diner's Club BIN range.

			//Diner's club international's website makes no reference to old 38 prefix numbers,

			//and they can be presumed reissued under the 55 or 36 BIN prefix

			case 7: //MasterCard* 51–55, 36 14 or 16 

				result = ((cardLen == 14) || (cardLen == 16)) && ((first2digs == "36") || (first2digs == "51") || (first2digs == "52") || (first2digs == "53") || (first2digs == "54") || (first2digs == "55") || (first2digs == "56") || (first2digs == "57")||(first2digs == "58") || (first2digs == "38"));

				break;

			case 8: //Visa 4 13 or 16 	

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

				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 validateText(txt){

	var d = "";

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

		if(txt.charAt(i) != " "){

			d = d + txt.charAt(i);

		}

	}

	if(d == ""){

		return false;

	}

	else{

		return true;

	}

}



function CheckField(frm, fname, ftitle){

	var s = frm.elements[fname].value;

	var d = "";

	

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

		if(s.charAt(i) != " "){

			d = d + s.charAt(i);

		}

	}

	if(d == ""){

		alert(msg_please_enter + ' ' + ftitle);

		frm.elements[fname].focus();

		return false;

	}

	else{

		return true;

	}

}



function CheckCustomFields(frm, place){

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

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

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

		//	alert(frm.elements[i].name);

			var s = frm.elements[i].name;

			var id = s.substring(13, s.length-1);

			if(frm.elements['custom_field_place[' + id + ']'].value == place){

				if(frm.elements['custom_field_required[' + id + ']'].value == 'yes'){

					//alert(frm.elements[i].type);

					if(frm.elements[i].type == "checkbox" && !frm.elements[i].checked){

						alert(msg_to_continue_please_check + ' ' + frm.elements['custom_field_name[' + id + ']'].value);

						frm.elements[i].focus();

						return false;

					}

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

						alert(msg_please_enter + ' ' + frm.elements['custom_field_name[' + id + ']'].value);

						frm.elements[i].focus();

						return false;

					}

				}

			}

		}

	}

	return true;

}



function CheckAddProduct(frm, min_order, max_order, allowed_max){

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

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

		alert(msg_numeric_product_quantity);

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

		return false;

	}

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

		alert(msg_number_of_items_exceeded_min);

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

		return false;

	}

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

		alert(msg_number_of_items_exceeded_max);

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

		return false;

	}

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

		alert(msg_number_of_items_exceed_inventory);

		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(msg_enter_valid_email);

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

		return false;

	}

	return true;

}



function CheckCartForm(frm){

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

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

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

	

	var products = new Array();

	

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

		

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

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

				alert(msg_numeric_product_quantity);

				frm.elements[i].focus();

				return false;	

			}

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

				alert(msg_number_of_items_exceeded_min);

				frm.elements[i].focus();

				return false;

			}

			if(

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

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

			){

				alert(msg_number_of_items_exceeded_max);

				frm.elements[i].focus();

				return false;

			}

			if(

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

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

			){

				alert(msg_number_of_items_exceed_inventory);

				frm.elements[i].focus();

				return false;

			}

		}

		

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

			var ocid = frm.elements[i].value;

			var pid = frm.elements["oa_ocid_to_pid[" + ocid + "]"].value;

			if(products[pid]){

				products[pid] = products[pid] + frm.elements["oa_quantity[" + ocid + "]"].value * 1;

			}

			else{

				products[pid] = frm.elements["oa_quantity[" + ocid + "]"].value * 1;

			}

			

			if(frm.elements["oa_inventory_control[" + ocid + "]"].value == "Yes"){

				if(frm.elements["allowed_oa_quantity[" + ocid + "]"].value < products[pid]){

					alert(msg_number_of_items_exceed_inventory);

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

					return false;

				}

			}

		}

	}

	return true;

}



function CheckNewsletters(frm){

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

		alert(msg_enter_valid_email);

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

		return false;

	}

	return true;

}



function CheckUnsubscribe(frm){

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

		alert(msg_enter_valid_email);

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

		return false;

	}

	if(confirm(msg_want_cancel_subscription)){

		return true;

	}

	return false;

}



function CheckLoginForm(frm){

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

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

	return true;

}



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

// CHECK SIGNUP FORM

function CheckSignupForm(frm, fm_company, fm_address2, fm_phone, ship2all, ship2countries){

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

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

	if(fm_company == "Required" && (!CheckField(frm, "form[company]", msg_company_name))) return false;

	if(!CheckField(frm, "form[address1]", msg_address_line1)) return false;

	if(fm_address2 == "Required" && (!CheckField(frm, "form[address2]", msg_address_line2))) return false;

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

	

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

	if(frm.elements["form[state]"].options.length > 1){

		if(frm.elements["form[state]"].value == "" || frm.elements["form[state]"].value == "0"){

			alert(msg_select_province_state);

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

			return false;

		}

	}

	else{

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

	}

	

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

	if(fm_phone == "Required" && (!CheckField(frm, "form[phone]", msg_phone_number))) return false;

	

	if(!CheckCustomFields(frm, 'billing')){

		return false;	

	}

	

	if(!ship2all && frm.elements["form[thesame]"].checked){

		//check shipping country

		c = frm.elements["form[country]"].value;

		is_country = false;

		for(i=1; i<= ship2countries.length; i++){

			if(ship2countries[i] == c){

				is_country = true;

			}

		}

		if(!is_country){

			alert(msg_incorrect_shipping_address);

			return false;

		}

	}

	

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

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

		alert(msg_enter_valid_email);

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

		return false;

	}

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

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

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

	

	if(!CheckCustomFields(frm, 'account')){

		return false;	

	}

	

	if(!CheckCustomFields(frm, 'signup')){

		return false;	

	}

	

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

		alert(msg_read_terms_before_registration);

		return false;

	}

	return true;

}



function CheckShippingAddress(frm, fm_company, fm_address2){

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

	if(fm_company == "Required" && (!CheckField(frm, "form[company]", msg_company_name))) return false;

	if(!CheckField(frm, "form[address1]", msg_address_line1)) return false;

	if(fm_address2 == "Required" && (!CheckField(frm, "form[address2]", msg_address_line2))) return false;

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

	

	

	//check is state/province select OR custom state/province

	sd = document.getElementById('div_shipping_address_state');



	if(sd.style.display == "block"){

		//check province/state from select

		if(frm.elements["form[state]"].value == "" || frm.elements["form[state]"].value == "0"){

			alert(msg_select_province_state);

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

			return false;

		}

	}

	else{

		//check custom province/state

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

	}

	

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

	

	if(!CheckCustomFields(frm, 'shipping')){

		return false;	

	}

	

	return true;

}



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

// CHECK PROFILE FORM

function CheckProfileForm(frm, fm_company, fm_address2, fm_phone){

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

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

	if(fm_company == "Required" && (!CheckField(frm, "form[company]", msg_company_name))) return false;

	if(!CheckField(frm, "form[address1]", msg_address_line1)) return false;

	if(fm_address2 == "Required" && (!CheckField(frm, "form[address2]", msg_address_line2))) return false;

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

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

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

	if(frm.elements["form[state]"].options.length > 1){

		if(frm.elements["form[state]"].value == "" || frm.elements["form[state]"].value == "0"){

			alert(msg_select_province_state);

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

			return false;

		}

	}

	else{

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

	}

	

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

	if(fm_phone == "Required" && (!CheckField(frm, "form[phone]", msg_phone_number))) return false;

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

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

		alert(msg_enter_valid_email);

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

		return false;

	}

	

	if(!CheckCustomFields(frm, 'billing')){

		return false;	

	}

	

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

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

			alert(msg_different_password_and_comfirmation);

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

			return false;

		}

	}

	

	if(!CheckCustomFields(frm, 'account')){

		return false;	

	}

	

	return true;

}



function CheckEmail2FriendForm(frm){

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

	if(!CheckField(frm, "yemail", msg_your_email_address)) return false;

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

		alert(msg_enter_valid_email);

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

		return false;

	}

	if(!CheckField(frm, "fname", msg_your_friend_name)) return false;

	if(!CheckField(frm, "femail", msg_your_friend_email_address)) return false;

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

		alert(msg_enter_valid_email);

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

		return false;

	}

	return true;

}



function ConfirmDeleteShippingAddress(delete_url){

	if(confirm(msg_confirm_delete_shipping_address)){

		document.location = delete_url;

	}

}