wait={
    start_time=0,
    total_time=0,
    old_update=nil,

    start=function(seconds)
        wait.old_update=update
        update=wait.update
        wait.total_time=seconds
        wait.start_time=time()
    end,

    update=function()
        wait.old_update()
        if wait.total_time <= time()-wait.start_time then
            update=wait.old_update
            scene.cont()
        end
    end
}