
<PAGE>

                                                                 Exhibit 12.1

                  STATEMENTS REGARDING COMPUTATION OF RATIOS

  Our earnings were insufficient to cover fixed charges in each of the years
in the three-year period ended December 31, 1997. Additional earnings of $6.4
million, $3.1 million and $3.6 million were necessary to provide a 1:1
coverage ratio for December 31, 1995, 1996 and 1997, respectively. For the
purpose of these calculations, "earnings" consist of income before taxes, plus
fixed charges, and "fixed charges" consist of interest expense incurred and
the portion of rental expense deemed by us to be representative of the
interest factor of rental payments under leases.

<TABLE>
<CAPTION>
                                                                    Year Ended        Six Months Ended
                               Year Ended                     ----------------------- ----------------
                              December 31,        Month Ended                                    July
                          ----------------------  January 31, January 31, January 30, August 1,  30,
                           1995    1996    1997      1998        1999        2000       1999     2000
                          ------  ------  ------  ----------- ----------- ----------- --------- ------
<S>                       <C>     <C>     <C>     <C>         <C>         <C>         <C>       <C>
Income (loss) before in-
 come taxes.............  (6,377) (3,077) (3,589)    1,481       4,487      56,166     19,177   60,013
Add fixed charges.......      65     298     352        41         602         832        407      384
                          ------  ------  ------     -----       -----      ------     ------   ------
Earnings (as defined)...  (6,312) (2,779) (3,237)    1,522       5,089      56,998     19,584   60,397
                          ======  ======  ======     =====       =====      ======     ======   ======
Fixed Charges:
  Interest expense......     --      216     267        31         291         332        192       92
  Estimated interest
   component of rent
   expense..............      65      82      85        10         311         500        215      292
                          ------  ------  ------     -----       -----      ------     ------   ------
Total fixed charges.....      65     298     352        41         602         832        407      384
                          ======  ======  ======     =====       =====      ======     ======   ======
Ratio of earnings to
 fixed charges..........     --      --      --        37x          8x         68x        48x     157x
</TABLE>
