function validateBookRequestform() {
  msg="Please fill in:\n\n";
  mval="";
  if (BookRequestForm.FullName.value=='') {
    mval="Full Name";
    event.returnValue=false;
  }
  if (BookRequestForm.Phone.value=='') {
    mval+="\nPhone Number";
    event.returnValue=false;
  }
  if (mval!="")
  {
    alert(msg+mval);
  }
}