<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>

This schedule contains summary financial  information extracted from the interim
financial  statement of income for the nine months ended  September 30, 1998 and
the balance  sheet as of September  30, 1998 and is qualified in its entirety by
reference to such financial statements.
</LEGEND>

       
<S>                                     <C>            <C>          <C>
<PERIOD-TYPE>                                 9-MOS          9-MOS        9-MOS
<FISCAL-YEAR-END>                       DEC-31-1998    DEC-31-1997  DEC-31-1996
<PERIOD-END>                            SEP-30-1998    SEP-30-1997  SEP-30-1996
<CASH>                                    3,530,437      1,149,670    3,175,674
<SECURITIES>                                    160     10,292,437   12,538,755
<RECEIVABLES>                            33,479,119     18,474,729    6,916,031
<ALLOWANCES>                             (2,395,487)      (835,000)    (380,000)
<INVENTORY>                                 385,552        308,453      261,338
<CURRENT-ASSETS>                         42,934,007     35,445,235   23,325,580
<PP&E>                                   21,448,613     13,425,029    9,121,231
<DEPRECIATION>                           (7,925,339)    (3,252,188)  (1,471,461)
<TOTAL-ASSETS>                           84,922,832     61,058,103   57,765,583
<CURRENT-LIABILITIES>                    24,734,197     16,763,606    5,388,453
<BONDS>                                     304,640        849,171        6,667
<PREFERRED-MANDATORY>                             0              0            0
<PREFERRED>                                       0              0            0
<COMMON>                                    191,434         92,707       85,173
<OTHER-SE>                               58,801,561     42,702,619   51,807,290
<TOTAL-LIABILITY-AND-EQUITY>             84,922,832     61,058,103   57,765,583
<SALES>                                  26,098,409     21,194,296    9,983,265
<TOTAL-REVENUES>                         68,732,574     48,896,128   22,869,765
<CGS>                                     2,592,323      2,284,532    1,327,546
<TOTAL-COSTS>                            21,827,723     16,176,549    6,445,173
<OTHER-EXPENSES>                         35,539,263     22,152,540   10,006,723
<LOSS-PROVISION>                            226,594              0            0
<INTEREST-EXPENSE>                           88,400        186,954        3,678
<INCOME-PRETAX>                          10,871,121     11,305,797    8,164,848
<INCOME-TAX>                              7,083,848      3,705,797    3,145,000
<INCOME-CONTINUING>                       3,787,263      7,554,985    5,019,848
<DISCONTINUED>                                    0              0            0
<EXTRAORDINARY>                                   0              0            0
<CHANGES>                                         0              0            0
<NET-INCOME>                              3,787,263      7,554,985    5,019,848
<EPS-PRIMARY>                                  0.20           0.41         0.30
<EPS-DILUTED>                                  0.19           0.40         0.28
        


</TABLE>