How to create a time Series with a given position argument ?

[Nour-Eddin Elfaouzi <elfaouzi@inrets.fr>]

 Hi all,
  
 Is there a simple way to create a time serie with a given time variable as 
position argument ?
 
 More precisely, I have data frame X given by :
 
         "0:03"  120    0   42
         "0:04"  180    0   84
         "0:05"  120    0   70
         "0:06"   -1   -1   -1
         "0:09"  120    0   76
         "0:10"  420    0   94
         "0:12"  120    0   82

What I want to do is to create a multivarite time series from that frame using 
the first column as the position argument of times series, and the remaining 
columns as data.

Any help is appreciated.

Thank you,

  
_