//checker list
function validateFormOnSubmit(contactform) {
var reason = "";

  reason += validateName(contactform.name);
  reason += validateEmail(contactform.email);
  reason += validatePhone(contactform.phone);
  reason += validateComments(contactform.comments);
      
  if (reason != "") {
    alert("Some fields need correction:\n \n" + reason);
    return false;
  }

  return true;
}




//empty name
function validateName(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        error = "You didn't enter your name.\n";
        fld.style.background = '#ffe3a6' 
    } else {
        fld.style.background = 'White';
    }
    return error;   
}


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

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = '#ffe3a6';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {
        fld.style.background = '#ffe3a6';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = '#ffe3a6';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}


//phone
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 = '#ffe3a6';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = '#ffe3a6';
    } else if (!(stripped.length > 10)) {
        error = "The phone numberis the wrong length. Make sure you included an area code.\n";
        fld.style.background = '#fe3a6';
    } else {
        fld.style.background = 'White';
    }
    return error;   
}


//empty comments
function validateComments(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        error = "The comments field has not been filled in.\n";
        fld.style.background = '#ffe3a6' 
    } else {
        fld.style.background = 'White';
    }
    return error;   
}