var _xPos = 20;
        var _yPos = 10;
        var _step = 1;
        var _delay = 20;
        var _height = 0;
        var _Hoffset = 0;
        var _Woffset = 0;
        var _yon = 0;
        var _xon = 0;
        var _pause = true;

        var _img = gid("pyimg");

        _img.style.top = _yPos;
        function changePos_1() {
            _width = document.documentElement.clientWidth;
            _height = document.documentElement.clientHeight;

            _Hoffset = _img.offsetHeight;
            _Woffset = _img.offsetWidth;
            _img.style.left = _xPos + document.documentElement.scrollLeft;
            _img.style.top = _yPos + document.documentElement.scrollTop;
            if (_yon) {
                _yPos = _yPos + _step;
            }
            else {
                _yPos = _yPos - _step;
            }
            if (_yPos < 0) {
                _yon = 1;
                _yPos = 0;
            }
            if (_yPos >= (_height - _Hoffset)) {
                _yon = 0;
                _yPos = (_height - _Hoffset);
            }
            if (_xon) {
                _xPos = _xPos + _step;
            }
            else {
                _xPos = _xPos - _step;
            }
            if (_xPos < 0) {
                _xon = 1;
                _xPos = 0;
            }
            if (_xPos >= (_width - _Woffset)) {
                _xon = 0;
                _xPos = (_width - _Woffset);
            }
        }
        function www_helpor_net_1() {
            _img.visibility = "visible";
            setInterval('changePos_1()', _delay);
        }
        www_helpor_net_1();