ScriptAction duration should not be 0

import Qt 4.7

Rectangle {
    width: 400
    height: 200

    function pausecomp(millis)
    {
        var date = new Date();
        var curDate = null;

        do { curDate = new Date(); }
        while(curDate-date < millis);
    }

    Rectangle {
        width: 50; height: 50
        color: "blue"
        SequentialAnimation on x {
            NumberAnimation { to: 200 }
            ScriptAction { script: pausecomp(1000) }
            NumberAnimation { to: 400 }
        }
    }
}