SGScript blinking light

function _BlinkLight( light )
{
    if( !light )
        return;
    function light_proc( light )
    {
        for( i = 0; i < 3; ++i )
        {
            light.enabled = true;
            yield 0.25;
            light.enabled = false;
            yield 0.25;
        }
    }
    thread light_proc( light );
}