function validateFreeDownload(thisForm){
	if(checkFName(thisForm.fName.value)){
		if(checkLName(thisForm.lName.value)){
			if(isEmpty(thisForm.churchName.value)){
				if(isEmpty(thisForm.churchAddress.value)){
					if(isEmpty(thisForm.churchCity.value)){
						if(checkDropdown(thisForm.churchState.value)){
							if(checkZip(thisForm.churchZip.value)){
								if(checkPhone(thisForm.churchPhone.value)){
									if(checkEmail(thisForm.churchEmail.value)){
										if(checkDropdown(thisForm.macPc.value)){
											if(checkDropdown(thisForm.referred.value)){
												return true;
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
	}
	return false;
}

function checkZip(strng){
	if ((strng.length == 10)) {
		var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
		if (isNaN(parseInt(stripped))) {
			error = "The zip code contains illegal characters.";
		}
		return true;
	}
    if ((strng.length != 5)) {
       error = "The zip code is the wrong length.\n";
		alert(error);
		return false;
	}
	return true;
}
// email

function checkEmail (strng) {
	var error="";
	if (strng == "") {
		error = "You didn't enter an email address.\n";
	}
	var emailFilter=/^.+@.+\..{2,3}$/;
	if (!(emailFilter.test(strng))) { 
		error = "Please enter a valid email address.\n";
	}
	else {
		//test email for illegal characters
		var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
		if (strng.match(illegalChars)) {
			error = "The email address contains illegal characters.\n";
		}
		
	}
	if (error != ""){
		alert(error);
		return false;
	}
	return true;
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
	var error = "";
	if (strng == "") {
	   error = "You didn't enter a phone number.\n";
	}
	var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.";
  
    }
    if (!(stripped.length == 10)) {
		error = "The phone number is the wrong length. Make sure you included an area code.\n";
		alert(error);
		return false;
	}
	return true; 
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
			alert(error);
			return false;
		}
		return true;   
}    


// first name

function checkFName (strng) {
	var error = "";
	if (strng == "") {
		error = "You didn't enter a first name.\n";
		alert(error);
		return false;
	}
	return true;
}       

// last name

function checkLName (strng) {
	var error = "";
	if (strng == "") {
		error = "You didn't enter a last name.\n";
		alert(error);
		return false;
	}
	return true;
}       

// church name

function checkChurchName (strng) {
	var error = "";
	if (strng == "") {
		error = "You didn't enter a church name.\n";
		alert(error);
		return false;
	}
	return true;
}       

// non-empty textbox

function isEmpty(strng) {
	var error = "";
		if (strng.length == 0) {
			error = "The mandatory text area has not been filled in.\n"
			alert(error);
			return false;
		}
		return true;  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
			alert(error);
			return false;
		}
		return true; 
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.\n";
		alert(error);
		return false;
	}
	return true; 
}

// valid selector from dropdown list

function checkDropdown(choice) {
	var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the drop-down list.\n";
			alert(error);
			return false;
		}
		return true; 
}