[jQuery] Syntax Error

Hy!
This is the code:
$("a.fdisplay").mousemove(function(e) {
var cssObj = {
left: e.pageX,
top: e.pageY-190,
}
$("div.fbaloon").css(cssObj);
});
Opera gives me a syntax error:
$("div.fbaloon").css(cssObj);
^
I'm trying to make a div folow my pointer on moving it across a link.
What seems to be the problem.
Can anyone please help?!?