[simple question] vertical / horizontal dendogram.

Hi,

I'm trying to use the hclust function... The plot result is vertical,  
I would prefer the horizontal version. Is it possible ?

R version:

i386-apple-darwin9.2.2
"R version 2.7.0 Patched (2008-05-11 r45672)"

Best regards, charles

--
Charles H?bert

Genome Organisation and Dynamics
Regulation of genetic expression, CNRS UMR 8541
Ecole Normale Sup?rieure
46, rue d'Ulm 75005 Paris, France