Description
void 
swf_modifyobject ( int depth, int how )
     Updates the position and/or color of the object at the specified
     depth, depth.  The parameter
     how determines what is updated.
     how can either be the constant MOD_MATRIX
     or MOD_COLOR or it can be a combination of both
     (MOD_MATRIX|MOD_COLOR).
    
     MOD_COLOR uses the current mulcolor (specified by the function
     swf_mulcolor()) and addcolor (specified by the
     function swf_addcolor()) to color the object.
     MOD_MATRIX uses the current matrix to position the object.