redirect to previous url

[eluser]nuttynibbles[/eluser]
hi,

as many of you have notice, if you were to go to (for e.g youtube) and you wanna post a comment, they require you to login. so you be redirected to login page and once login, they will redirect you back to the same page where you wanted to comment..

if im not wrong, we can use HTTP_REFERER to get previous url and save it into session??. but is there a better way??