function verify() {
var themessage = "You are required to complete the following fields: ";
if (document.form.first_name.value=="") {
themessage = themessage + " - First Name";
}
if (document.form.last_name.value=="") {
themessage = themessage + " -  Last Name";
}
if (document.form.email.value=="") {
themessage = themessage + " -  E-mail";
}
//alert if fields are empty and cancel form submit
if (themessage == "You are required to complete the following fields: ") {
document.form.submit();
}
else {
alert(themessage);
return false;
   }
}

var win = null;
function newWindow(mypage,myname,w,h,features) {
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  if (winl < 0) winl = 0;
  if (wint < 0) wint = 0;
  var settings = 'height=' + h + ',';
  settings += 'width=' + w + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  settings += features;
  win = window.open(mypage,myname,settings);
  win.window.focus();
}