function valid() {
 if (document.sendme.name.value.lenth == 0)  {
   alert('Please fill Name field.');
   return false; }
 else if (document.sendme.comment.value.length == 0) {
   alert('Please fill Comment field.');
   return false; }
 else if (document.sendme.comment.value.length > 255) {
   alert('Comment too long. Max characters=255');
   return false; }
 else
   return true;
}

function nextpage() {
 document.nav.page.value = "<?php echo $next_page; ?>";
 document.submitForm.nav();
}
function previouspage() {
 document.nav.page.value = "<?php echo $prev_page; ?>";
 document.submitForm.nav();
}