NAME
        LockLayers -- lock all layers from graphics output.

    SYNOPSIS
        LockLayers( li )
                    a0

        void LockLayers( struct layer_info *);

    FUNCTION
        First calls locklayerinfo()
        Make all layers in this layer list locked.

    INPUTS
        li - pointer to layer_info structure

    BUGS

    SEE ALSO
        locklayer(), locklayerinfo(), graphics/layers.h