Jquery UI dialog 위치

<script>
$(document).ready(function(){
    $('#modal_dialog').dialog({
        title:"팝업창 제목"
        ,modal:false
        ,resizable:false
        ,autoOpen:false
        ,width:"auto"
        ,height:250
        ,open:function(e, ui) {
            $(this).sibling(".ui-dialog-titlebar").find("button").blur(); // remove focus from close button
            $(this).parent().offset({top:150,left:100});
        }
    });
});

</script>