http://jsfiddle.net/jqrmh/
$(".one").position({
        "my": "right top",
        "at": "right top",
        "of": $(".main"),
});
I need to my box still stay right-top when i resize window... I try to use "collision": "fit fit" ..... it not work
http://jsfiddle.net/jqrmh/
(http://wiki.jqueryui.com/w/page/12138026/Position)
You could just re-position on resize:
http://jsfiddle.net/jqrmh/4/
function moveit() {
    $(".one").position({
        "my": "right top",
        "at": "right top",
        "of": $(".main"),
        "collision": "fit fit"
    });
}
$(window).resize(function(){
   moveit(); 
});
moveit();
Alternatively, assuming there's not some other reason you can't just use css:
Just set the parent positon:relative and set the child position:absolute.  Then you can just set the child top:0; right:0.
http://jsfiddle.net/jqrmh/5/
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