APEX

Using Apex 4.1.1

I have button which opens up a pop-up showing a report passing some parameter in URL. The button calls the javascript function defined below:

<script language="JavaScript" type="text/javascript">
  function newReport()
	{
		url = 'f?p=&APP_ID.:37:&APP_SESSION.::NO::P37_ORDER_ID,P37_PLACE_ID,P37_NCR_TO:&P21_ORDER_ID.,&P21_PLACE_ID.,&P21_NCR_TO.';
		w = open(url,"winLov3","position=center, top=1,left=0,Scrollbars=0,resizable=0,width=800,height=800");
		if (w.opener == null)
		w.opener = self;
		w.focus();		
	}			
</script>

It all works well but for security I would like to add checksum to arguments in URL. I had a look at the Javascrpt API for Apex and couldn't find any for creating a checksum I can append to the URL.

Is there one that I missed or is it possible to do it by other means? Cheers.