renumber a list of numbers

Greetings R users,

I am trying to renumber my groups within the file shown below.  The  
groups
are currently set as 8,9,10,etc.  I would like to renumber this as
1,2,3,etc.  I have searched the help files and only come across  
using the
rownames to renumber the values but I need to match values.  Any  
assistance
is always appreciated,

Regards,
Charles

structure(list(Group = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("NO", "YES"
), class = "factor"), Event_name = c(8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31, 33, 34, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30), Glucose.n = c(26, 3,
0, 26, 1, 25, 26, 25, 25, 26, 26, 25, 23, 23, 24, 24, 26, 26,
25, 25, 26, 26, 24, 21, 7, 12, 4, 0, 0, 4, 0, 4, 4, 4, 4, 4,
4, 4, 3, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1), Glucose.m = c(92.5,
90.3333333333333,
NaN, 97.2307692307692, 116, 97.84, 107.653846153846, 105.32,
102.6, 94.6538461538462, 96.076923076923, 92.24, 87.5652173913043,
79.3913043478261, 81.2916666666667, 77.5, 75.9230769230769,
74.4615384615385,
72.68, 76.32, 74.9615384615385, 72.2307692307692, 92.5416666666667,
105.619047619048, 93.4285714285714, 96.5, 90, NaN, NaN, 86.5,
NaN, 87, 90.25, 92.5, 98.75, 95.75, 94, 88.25, 54.3333333333333,
52, 74.5, 77.75, 81, 97.3333333333333, 82.5, 85, 66.5, 51, 81
), Glucose.sd = c(18.9256439784753, 27.5922694487665, NA,  
25.3050314242961,
NA, 17.3917605012642, 21.027491163127, 12.0094407308029,  
28.0728219695373,
17.7334538264655, 10.7700439253443, 12.7778454104490,  
11.0075432274935,
14.6992242542214, 12.2739709270814, 10.9266328000819,  
10.4457573279225,
13.1338669682033, 8.2194890352138, 19.9556174213344, 17.6079090620795,
10.9299869800753, 19.3052801217623, 29.7883806046522,  
17.2032665779607,
18.4563366797521, 18.0554700852678, NA, NA, 19.7399763593239,
NA, 22.3159136044214, 28.5116935075184, 21.7638844572072,  
12.2848144742469,
12.0933866224478, 15.5777619273972, 11.842719282327, 39.1066916694999,
32.0936130717624, 66.8755062286136, 53.7796429887741,  
17.6918060129541,
11.5902257671425, 34.6482322781408, 9.89949493661167,  
26.1629509039023,
NA, NA), Glucose.se = c(3.71162415205983, 15.9304041937980, NA,
4.96272496248326, NA, 3.47835210025284, 4.12383029856479,  
2.40188814616057,
5.61456439390745, 3.47781642709786, 2.11217938990701,  
2.55556908208981,
2.29523142628873, 3.06500013246251, 2.50541382409208,  
2.23038958057991,
2.04858155574352, 2.57576322922309, 1.64389780704276,  
3.99112348426689,
3.45319507311964, 2.14354680364304, 3.94067380331773,  
6.50035756909396,
6.50222358617618, 5.32788547515463, 9.0277350426339, NA, NA,
9.86998817966195, NA, 11.1579568022107, 14.2558467537592,  
10.8819422286036,
6.14240723712346, 6.04669331122391, 7.78888096369861,  
5.92135964116351,
22.5782589625015, 16.0468065358812, 33.4377531143068,  
26.8898214943871,
10.2143689640297, 6.69161996662824, 24.5, 7, 18.5, NA, NA)), .Names =
c("Group",
"Event_name", "Glucose.n", "Glucose.m", "Glucose.sd", "Glucose.se"
), row.names = c(9L, 10L, 11L, 12L, 13L, 14L, 15L, 16L, 17L,
18L, 19L, 20L, 21L, 22L, 23L, 24L, 25L, 26L, 27L, 28L, 29L, 30L,
31L, 32L, 33L, 34L, 41L, 42L, 43L, 44L, 45L, 46L, 47L, 48L, 49L,
50L, 51L, 52L, 53L, 54L, 55L, 56L, 57L, 58L, 59L, 60L, 61L, 62L,
63L), class = "data.frame")

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