function validateFormOnSubmit(theForm) {
var reason = "";

  reason += validateFname(theForm.fname);
  reason += validateLname(theForm.lname);
  reason += validateEmail(theForm.email);
  reason += validatePhone(theForm.phone);
  reason += validateMessage(theForm.question)
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  } else {

  
	  dochange(theForm.fname.value + "~~~~~" + theForm.lname.value + "~~~~~" + theForm.phone.value + "~~~~~" + theForm.email.value + "~~~~~" + theForm.question.value + "~~~~~" + theForm.rememberme.checked);
	  //alert('Thank you. Your message has been submitted');
	  return true;
  }

  
}


function validateMessage(fld) {
	var error = "";
	if (fld.value.length <=3) {
		error = "Your message is too short \n"
	}
	return error;
}
function validateEmpty(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;  
}
function validateFname(fld) {
    var error = "";
    var illegalChars = /[^a-zA-Z_-]/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter your first name.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 50)) {
        fld.style.background = 'Yellow'; 
        error = "wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "Your first name containts illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}


function validateLname(fld) {
    var error = "";
    var illegalChars = /[^a-zA-Z_-]/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter your first name.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 50)) {
        fld.style.background = 'Yellow'; 
        error = "wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "Your last name containts illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validatePassword(fld) {
    var error = "";
    var illegalChars = /[\W_]/; // allow only letters and numbers 
 
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter your last name.\n";
        fld.style.background = 'Yellow';
    } else {
        fld.style.background = 'White';
    }
   return error;
}  
function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
}

function validatePhone(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');    

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Yellow';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Yellow';
    } else {
    	fld.style.background = 'White';
    }
    return error;
}



function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
   
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}