function isChar(theField, theMessage) {
  if(theField.value.length >=1) {
    alert(theMessage);
	theField.focus();
	return false;
  }
  return true;
}


function isPhoneNumber(theField,theLength,fieldLabel) {
 if(isNaN(theField.value)==true || theField.value.length!=theLength) {
    alert('Please enter a valid "'+fieldLabel+'".');
	theField.value='';
	theField.focus();
	return false;
  }
  return true;
}

function isStateSelected(theField,fieldLabel) {	    
	if (theField.selectedIndex <= 0 ){
		alert('Please select a "'+fieldLabel+'".');
		theField.focus()
		return false;
	}	
}

function isZipcode(theField,theLength,fieldLabel) {
  if(!validRequired(theField,fieldLabel)){
       	return false;
  }
  if(isNaN(theField.value)==true || theField.value.length!=theLength) {
    alert('Please enter a valid "'+fieldLabel+'"');
	theField.value='';
	theField.focus();
	return false;
  }
  return true;
}

function isAccount(theField,theLength,fieldLabel) {
  if(isNaN(theField.value)==true || theField.value.length<9) {
    alert('Please enter a valid "'+fieldLabel+'".');
	theField.value='';
	theField.focus();
	return false;
  }
  return true;
}

function checkServiceCity(theField,theMessage) {  
  if(theField.options[0].selected==true) {
    alert(theMessage);
	theField.value='';
	theField.focus();
	return false;
  }
  return true;
}


function validateEmail(theField,fieldLabel) {		
	var char1=theField.value.indexOf("@");
	var char2=theField.value.indexOf(".",char1+2);
	//checking if the address includes the character '@' , preceded by at least one character.;
	//and '.'
	if (char1<=0 || char2 == -1){
		alert('Please enter a valid "'+fieldLabel+'".');
		theField.value = '';
		theField.focus();
		return false;
	}		
	var str=theField.value.substring(char2+1,theField.value.length);
	if (str.length == 0){
		alert('Please enter a valid "'+fieldLabel+'".');
		theField.value = '';
		theField.focus();
		return false;
	}
	//toUpper(which);
	return true;
}

function validateName(theField,fieldLabel) {	    
        var valid="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-' "
        var temp
        var ok = "yes"
        for (var i=0;i<theField.value.length;i++) {
        	temp=""+theField.value.substring(i,i+1);
        	if(valid.indexOf(temp)== "-1") {
        		ok = "no";
        	}
        }
        if (ok == "no") {
        	alert('"'+fieldLabel +'" '+ "is invalid. Only characters [a-z], [A-Z], and ['] are allowed.");
        	theField.value="";
        	theField.focus();
        	return false;
        } else {
        	return true;
        }
}

function characterCheck(theField,fieldLabel) {
	var a =(theField.value)
	for (var j=0; j<a.length; j++)	{
		var oneChar = a.substring(j, j + 1)
		if 	(((oneChar >= "a" && oneChar <= "z") || (oneChar >= "A" && oneChar <= "Z") || oneChar == ' ') != 1) {
			alert('Enter only characters for "'+fieldLabel+'".')
			theField.value='';
			theField.focus()
			return false
		}
	}
	return true 	
}


function isPhoneNumbers(theField,theLength,FieldLabel) {
  if(isNaN(theField.value)==true || theField.value.length!=theLength) {
    alert('Please enter a valid "'+FieldLabel+'".');
	theField.value="";
	theField.focus();
	theForm.contact[0].checked = true;
	document.orderform.contact.selected=false;
	return false;
  }
  return true;
}


function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter the "' + fieldLabel +'".');
		formField.focus();
		result = false;
	}
	
	return result;
}


function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{		    
			result = false;
			break;
		}
	
	return result;
}


function isValidExpDate(formField,fieldLabel,required)
{
	var result = true;
	var formValue = formField.value;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result && (formField.value.length>0))
 	{
 		var elems = formValue.split("/");
 		
 		result = (elems.length == 2); // should be two components
 		var expired = false;
 		
 		if (result)
 		{
 			var month = parseInt(elems[0],10);
 			var year = parseInt(elems[1],10);
 			
 			if (elems[1].length == 2)
 				year += 2000;
 			
 			var now = new Date();
 			
 			var nowMonth = now.getMonth() + 1;
 			var nowYear = now.getFullYear();
 			
 			expired = (nowYear > year) || ((nowYear == year ) && (nowMonth > month));
 			
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && ((elems[1].length == 2) || (elems[1].length == 4));
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format MM/YY for the "' + fieldLabel +'" field.');
			formField.value="";
			formField.focus();
		}
		else if (expired)
		{
 			result = false;
 			alert('The date for "' + fieldLabel +'" has expired.');
			formField.value="";
			formField.focus();
		}
	} 
	
	return result;
}

function isValidCreditCardNumber(formField,ccType,fieldLabel,required)
{
	var result = true;
 	var ccNum = formField.value;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
 
  	if (result && (formField.value.length>0))
 	{ 
 		if (!allDigits(ccNum))
 		{
 			alert('Please enter only numbers (no dashes or spaces) for the "' + fieldLabel +'" field.');
			formField.value="";
			formField.focus();
			result = false;
		}	

		if (result)
 		{ 
 			
 			if (!LuhnCheck(ccNum) || !validateCCNum(ccType,ccNum))
 			{
 				alert('Please enter a valid card number for the "' + fieldLabel +'" field.');
				formField.value="";
				formField.focus();
				result = false;
			}	
		} 

	} 
	
	return result;
}

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 checkRadioButton(formField,fieldLabel)
{
// set var radio_choice to false
var radio_choice = false;

// Loop from zero to the one minus the number of radio button selections
for (counter = 0; counter < formField.length; ++counter)
{
	if (formField[counter].checked)
	{
		radio_choice = true; 
        }
}

if (!radio_choice)
{
// If there were no selections made display an alert box 
alert('Please select a "'+fieldLabel+'".');
formField.value="";
return (false);
}
return (true);
}


function GetRadioValue(rArray)
{
	for (var i=0;i<rArray.length;i++)
	{
		if (rArray[i].checked)
			return rArray[i].value;
	}
	
	return null;
}


function validateCCNum(cardType,cardNum)
{
	var result = false;
	cardType = cardType.toUpperCase();
	
	var cardLen = cardNum.length;
	var firstdig = cardNum.substring(0,1);
	var seconddig = cardNum.substring(1,2);
	var first4digs = cardNum.substring(0,4);

	switch (cardType)
	{
		case "VISA":
			result = ((cardLen == 16) || (cardLen == 13)) && (firstdig == "4");
			break;
		case "AMEX":
			var validNums = "47";
			result = (cardLen == 15) && (firstdig == "3") && (validNums.indexOf(seconddig)>=0);
			break;
		case "MASTERCARD":
			var validNums = "12345";
			result = (cardLen == 16) && (firstdig == "5") && (validNums.indexOf(seconddig)>=0);
			break;
		case "DISCOVER":
			result = (cardLen == 16) && (first4digs == "6011");
			break;
		case "DINERS":
			var validNums = "068";
			result = (cardLen == 14) && (firstdig == "3") && (validNums.indexOf(seconddig)>=0);
			break;
		case "NOTAVAIL":
			result = true;
			break;
	}
	return result;
}



function validCCForm(ccTypeField,ccNumField,ccExpField)
{
    if(ccTypeField=="NOTAVAIL")		
		var result = isValidCreditCardNumber(ccNumField,"NOTAVAIL","Credit Card Number",true) &&	isValidExpDate(ccExpField,"Expiration Date",true);
	else
		var result = isValidCreditCardNumber(ccNumField,ccTypeField.value,"Credit Card Number",true) &&	isValidExpDate(ccExpField,"Expiration Date",true);
	return result;
}

function validCVV(theField,fieldLabel)
{
  if(!allDigits(theField.value)) { 
    theField.value="";
	theField.focus();
  	alert('Please enter a valid "'+fieldLabel+'".');
  	return false;
  }
  
}


function valSSN(theField,theLength,theMessage) {
	  if(isNaN(theField.value)==true || theField.value.length!=theLength) {
    	alert(theMessage);
		theField.focus();
		return false;
 }
  return true;
}

function TermsCheckBox(){	
		if (document.orderform.accept.checked){

		} else{
			alert("Please check the Terms and Condition box to continue with order." );
			document.orderform.accept.select();
			document.orderform.accept.focus();
			return false;
		}
}