Hi! (: I have the following code that displays the time based on the end-users computer time clock. How would I change it so that the end-user sees the greeting based on GMT time zone???

Code:
<SCRIPT LANGUAGE="Javascript">
<!--
{
	helixtime = new Date()
	hrstime = helixtime.getHours()
	if (hrstime < 7){timemsg = "You're up <B>really</B> early! "}
	if (hrstime > 6 && hrstime <12){timemsg = "Good morning! "}
	if (hrstime > 11 && hrstime <18){timemsg = "Good afternoon! "}
	if (hrstime >17){timemsg = "Good evening! "}
	document.write(timemsg)}
// -->
</SCRIPT>