pass a php variable to javascript?

[sabret00the]

<script type="text/javascript">
/**
* Opens an IM Window
*
* @param	string	IM type
* @param	integer	User ID
* @param	integer	Width of window
* @param	integer	Height of window
*
* @return	window
*/
function grps_imwindow(imtype, userid, width, height)
{
	return openWindow(
		grps_bburl + '/sendmessage.php?' + SESSIONURL + 'do=im&type=' + imtype + '&u=' + userid,
		width, height
	);
}
</script>

the grps_bburl is what i'm trying to pass, that's defined as

PHP Code:

$grps_bburl = $vbulletin->options['bburl']; 


shortly before the template with the jscript is.

i am now the js master

i simply approached it like it was php and it works lol.