The only thing that I can think of is that the top command
on your system is not outputting the same info that mine is,
mine gives:

load averages:  0.50,  0.47,  0.41    13:03:12
83 processes:  81 sleeping, 1 running, 1 on cpu

Memory: 256M real, 128M free, 64M swap in use, 192M swap free


  PID USERNAME THR PRI NICE  SIZE   RES STATE   TIME    CPU COMMAND
14600 baw        1  36    0   32M   21M run     7:30  8.06% netscape
[download]

If the Memory: line is different in your output, then the regex
that pulls the memory info won't place a value into totSwap. This
is because i'm using array subscripting to pull the values out of
the @memInfo array. Try changing $memInfo[?] to where the correct
swap values would be.

--xPhase