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

   reason += validateName(contact.name);
   reason += validatePhone(contact.telephone_number);
   reason += validateEmail(contact.email_address);
   reason += validateWebsite(contact.website);
   reason += validateComment(contact.comment);
	 
  if (reason != "") {
    alert("" + reason);
    return false;
  }
}

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

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

   if (fld.value == "") {
        error = "Please enter a phone number.\n";
        fld.style.background = 'Yellow';
    } else if (isNaN(parseInt(stripped))) {
        error = "Please enter a valid phone number.\n";
        fld.style.background = 'Yellow';
    } else if (!(stripped.length > 9)) {
        error = "Please enter a valid phone number.\n";
        fld.style.background = 'Yellow';
    } 
    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 = "Please 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 = "Please ensure a valid email address.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

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

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