function checkLibraryCard()
{
  var msg = prompt('Please enter your library card number without spaces',''); 
  if (!msg || msg.length != 14 ||(msg.substring(0,5) != '24388')) 
  { 
    alert('Invalid card number entered'); 
    this.href='http://www.ci.walla-walla.wa.us/index.asp?Type=B_BASIC&SEC=%7B82019836-B457-4EBF-81E5-BC8E917B41E9%7D'; 
  }
}