i removed following code.
<?php
$lastCheck = (int)osc_last_version_check() ;
$hourInSecs = 24 * 3600 ;
?>
<?php if ( (time() - $lastCheck) > $hourInSecs ) { ?>
<script type="text/javascript">
$(function() {
var version = <?php echo osc_version() ; ?> ;
$.getJSON("
http://osclass.org/latest_version.php?callback=?", function(data) {
var update = document.getElementById('update_version') ;
if(data.version > version) {
var text = '<?php printf(__('OSClass %s is available!'), '\' + data.s_name + \'') ; ?> <a href="index.php?page=tools&action=upgrade"><?php _e('Please upgrade now') ; ?></a>' ;
update.innerHTML = text ;
update.setAttribute('style', '') ;
}
});
});
</script>
<?php } ?>
and my problem is solved.
thanks.