var currentLayer = 'page1';

function showLayer(lyr) {
   var errorMsg = document.getElementById('nelson-free-error')
   if (errorMsg != null) {
       errorMsg.parentNode.removeChild(errorMsg);
   }
   hideLayer(currentLayer);
   document.getElementById(lyr).style.display = 'block';
   currentLayer = lyr;
}

function hideLayer(lyr) {
   document.getElementById(lyr).
      style.display = 'none';
}

function verifyMe(form){
var msg='';

if(document.getElementById('firstName').value==''){
	msg+='- First Name\n\n';}

if(document.getElementById('lastName').value==''){
	msg+='- Last Name\n\n';}

var email=document.getElementById('emailAddress').value;
if(!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email))){
msg+='- Invalid Email Address: '+email+'\n\n';}

if(document.getElementById('emailAddress').value==''){
	msg+='- Email Address\n\n';}

if(document.getElementById('isbn').value==''){
	msg+='- ISBN\n\n';}

if(document.getElementById('securityCode').value==''){
	msg+='- Secret Word\n\n';}

if(msg!=''){
	alert('The following fields are empty or invalid:\n\n'+msg);
	return false
}else{
	showValues(form);

	return true }
	

}