function changeTimezone()
{
	var tzWindow = window.open("","info","width=400,height=250");
	with (tzWindow.document)
	{
		write('Select your time zone<P>');
		write ( '<select name=timezone>');
		for (i=-12 ; (i<=12) ; i+=0.5)
		{
			write ('<option value= ' + i + '>'+ i + '</option>');
		}
		write ('</select>');
		write('<p><input type=submit value=Update></form>');
	}
}