Trouble with zoo + POSIXct/POSIXlt

After successfully using the 'its' package, I've been trying out 'zoo'
for some of its more advanced functions.  I can coerce my its objects
into zoo objects without problem.
Yet I'm having trouble understanding the read.zoo function's errors.
It seems that my index class, POSIXct, is the problem.

I have csv files like this:
7/23/2003 4:05:51 PM,9.35,98.027
7/23/2003 4:20:51 PM,9.32,97.954

-----------------------
#First try:

my.format = "%m/%d/%Y %I:%M:%S %p"
x=read.zoo(myfile, sep=',', skip=30, format=my.format)
z

V2      V3
2003-07-23 9.35  98.027
2003-07-23 9.32  97.954

summary(z)

Error in "row.names<-.data.frame"(`*tmp*`, value = NULL) :
        invalid 'row.names' length
#format= doesn't seem to work here, error means index not #unique?
#
#Second try,
#This works:

x=read.table(myfile, sep=',' , skip=30,\

x[,1]=as.POSIXct(strptime(x[,1], format=my.format,\ tz='UTC+6'))

y=zoo(x[,2:3], order.by=x[,1])

#
#but this doesn't:
#

x=read.zoo(my.file, sep=',',skip=30,\

FUN=as.POSIXct(strptime(as.character(x), format=my.format,
tz='UTC+6')) )
Error in read.zoo(files[1], sep = ",", skip = 30, FUN =
as.POSIXct(strptime(as.character(x),  :
        couldn't find function "FUN"
---------
Any idea what the last error message means?
TIA,
christian