Grace notes before the beat ?

[Alexandre et/ou Sophie Beneteau]

Hi everybody,

I would like to know if there is a simple way to ask lilypond to put
grace notes *before* the beat and not onto it ?

See the example bellow, and the output coded with lilypond 1.3.120 :

\header {
    tagline = "";
}
\include "italiano.ly"
\score {
\notes
\relative do'
{ 
    \time 6/8;
    do2.-\trill \grace {[si16 do]}
    re2.
    \bar "|.";
}
}

Thanks,

        Alex.

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