what is the script for making those pop up in css for friendster?? is there any?? i see someone have it in friendster. i tought that is javascript?
i know this if for javascript

<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
<script language="JavaScript">
function CONFIRM(){if (!confirm
("Welcome."))
history.go(-1);return " "}
document.writeln(CONFIRM())
</script>

but i don't know what is for css. can anyone teach me? i need your guidance.

and one more how to make like for example when a visitor left or enters it will do a effect. how to do that in css? thanks in advance.

You can't do either of them in CSS.
For your last question it's a page transition: http://www.dynamicdrive.com/dynamicindex3/document2.htm

erm i saw this in the forum. this person have the pop up thing. look: http://www.friendster.com/user.php?uid=19891650

hmm? so u have any idea?