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

  reason += validateEmpty(theForm.realname);
  reason += validateEmpty(theForm.address1);
  reason += validateEmpty(theForm.city);
  reason += validateEmpty(theForm.state);
  reason += validateEmpty(theForm.zip);
  reason += validateEmail(theForm.email);
  reason += validateEmpty(theForm.phone);
      
  if (reason != "") {
    alert("Please correct the highlighted fields:\n" + reason);
    return false;
  }

  return true;
}

function validateEmpty(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "Oops! A required field is blank.\n"
    } 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 = "Oops! A required field is blank.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "Enter a valid email address.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}