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

  reason += validateFirst_Name(theForm.First_Name);
  reason += validateLast_Name(theForm.Last_Name);
 /*
  reason += validateAddress1(theForm.Address1);
  reason += validateCity(theForm.City);
  reason += validateState(theForm.State);
  reason += validateZip(theForm.Zip);
 */ 
  reason += validatePhone(theForm.Phone);
  reason += validateEmail(theForm.email);
      
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }

  return true;
}

function validateFirst_Name(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your first name.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateLast_Name(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your last name.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateAddress1(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your address.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateCity(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your city.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateState(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your province or state.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateZip(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Please enter your postal or zip code.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}


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 trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

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;
}