function move(step) {
    if (!window.moveFlag)
        window.moveFlag = 1;

    if (window.moveFlag != 2) {
        var movable = new System.UI.Movable('tb_product_info');
        var tds = movable.MoveElement.getElementsByTagName('h5');
        if (!window.moveCount)
            window.moveCount = 0;
        if (tds.length > 3) {
            if (step < 0) {//左移
                if (window.moveCount < tds.length - 3) {
                    window.moveFlag = 2;
                    window.moveCount++;
                    movable.MoveBy(step, 0, 8, 1, function () { window.moveFlag = 1; });
                }
            }
            else { // 右移
                if (window.moveCount > 0) {
                    window.moveFlag = 2;
                    window.moveCount--;
                    movable.MoveBy(step, 0, 8, 1, function () { window.moveFlag = 1; });
                }
            }
        }
    }
};