limit only one request-response loop per request

Hi

Is there any way to ensure only one request-response loop occurred for each 
request?

I noticed there are 2 loops going on even for the same action "goPrevWeek", 
for instance.  It creates problem now as dealing with date, that the date is 
increased/decreased twice when ever an action is triggered.

Moreover, it worked for IE but not Firefox.  Please advise.  Thanks.

=== sample data ====
May 10 17:52:47 [Debugger]: [TimeSheetEntryPage ->goPrevWeek] go previous 
week from 2006-05-16 21:41:53 Etc/GMT
May 10 17:52:47 [Debugger]: [TimeSheetEntryPage ->calFunction] end of week: 
Sat 2006.05.13 at 05:41:53 AM SGT--4
May 10 17:52:47 [Debugger]: [TimeSheetEntryPage ->calFunction] start of 
week: Sun 2006.05.07 at 05:41:53 AM SGT--4
[2006-05-10 17:52:47 SGT] <WorkerThread8>  === Begin Internal Transaction
[2006-05-10 17:52:47 SGT] <WorkerThread8>  evaluateExpression: 
<com.webobjects.jdbcadaptor.FrontbasePlugIn$FrontbaseExpression: "SELECT 
t0."APPROVE_BY_TIMESHEET_RESOURCE_KEY", t0."APPROVED_DATE", 
t0."CREATION_DATE", t0."MODIFICATION_DATE", t0."REFERENCE_CODE", 
t0."REMARK", t0."REVIEW_BY_TIMESHEET_RESOURCE_KEY", t0."REVIEW_DATE", 
t0."TIMESHEET_KEY", t0."TIMESHEET_RESOURCE_KEY", t0."TOTAL_FRIDAY_MAN_HOUR", 
t0."TOTAL_MONDAY_MAN_HOUR", t0."TOTAL_SATURDAY_MAN_HOUR", 
t0."TOTAL_SUNDAY_MAN_HOUR", t0."TOTAL_THURSDAY_MAN_HOUR", 
t0."TOTAL_TUESDAY_MAN_HOUR", t0."TOTAL_WEDNESDAY_MAN_HOUR", t0."VNAME", 
t0."WEEK_ENDING_DATE", t0."WEEK_OF_YEAR", t0."WEEK_STARTING_DATE", 
t0."VYEAR" FROM "TIMESHEET" t0, "LOG_ON_USER" T3, "TIMESHEET_RESOURCE" T1, 
"RESOURCE" T2 WHERE (T3."CONTACT_NAME" = 'Supervisor' AND t0."VYEAR" = 2006 
AND t0."WEEK_OF_YEAR" = 19) AND T2."LOG_ON_USER_KEY" = T3."CONTACT_KEY" AND 
t0."TIMESHEET_RESOURCE_KEY" = T1."RESOURCE_SERVICE_KEY" AND 
T1."RESOURCE_KEY" = T2."RESOURCE_KEY"">
[2006-05-10 17:52:47 SGT] <WorkerThread8> 1 row(s) processed
[2006-05-10 17:52:47 SGT] <WorkerThread8>  === Commit Internal Transaction
May 10 17:52:47 [Debugger]: [TimeSheetEntryPage ->getTimesheetWeek] 
getTimeSheetWeek() timesheet.weekOfYear()   selected year> 2006  selected 
weekOfYear> 19
May 10 17:52:53 [Debugger]: [TimeSheetEntryPage ->goPrevWeek] go previous 
week from 2006-05-09 21:41:53 Etc/GMT
May 10 17:52:53 [Debugger]: [TimeSheetEntryPage ->calFunction] end of week: 
Sat 2006.05.06 at 05:41:53 AM SGT--4
May 10 17:52:53 [Debugger]: [TimeSheetEntryPage ->calFunction] start of 
week: Sun 2006.04.30 at 05:41:53 AM SGT--3
[2006-05-10 17:52:53 SGT] <WorkerThread2>  === Begin Internal Transaction
[2006-05-10 17:52:53 SGT] <WorkerThread2>  evaluateExpression: 
<com.webobjects.jdbcadaptor.FrontbasePlugIn$FrontbaseExpression: "SELECT 
t0."APPROVE_BY_TIMESHEET_RESOURCE_KEY", t0."APPROVED_DATE", 
t0."CREATION_DATE", t0."MODIFICATION_DATE", t0."REFERENCE_CODE", 
t0."REMARK", t0."REVIEW_BY_TIMESHEET_RESOURCE_KEY", t0."REVIEW_DATE", 
t0."TIMESHEET_KEY", t0."TIMESHEET_RESOURCE_KEY", t0."TOTAL_FRIDAY_MAN_HOUR", 
t0."TOTAL_MONDAY_MAN_HOUR", t0."TOTAL_SATURDAY_MAN_HOUR", 
t0."TOTAL_SUNDAY_MAN_HOUR", t0."TOTAL_THURSDAY_MAN_HOUR", 
t0."TOTAL_TUESDAY_MAN_HOUR", t0."TOTAL_WEDNESDAY_MAN_HOUR", t0."VNAME", 
t0."WEEK_ENDING_DATE", t0."WEEK_OF_YEAR", t0."WEEK_STARTING_DATE", 
t0."VYEAR" FROM "TIMESHEET" t0, "LOG_ON_USER" T3, "TIMESHEET_RESOURCE" T1, 
"RESOURCE" T2 WHERE (T3."CONTACT_NAME" = 'Supervisor' AND t0."VYEAR" = 2006 
AND t0."WEEK_OF_YEAR" = 18) AND T2."LOG_ON_USER_KEY" = T3."CONTACT_KEY" AND 
t0."TIMESHEET_RESOURCE_KEY" = T1."RESOURCE_SERVICE_KEY" AND 
T1."RESOURCE_KEY" = T2."RESOURCE_KEY"">
[2006-05-10 17:52:53 SGT] <WorkerThread2> 1 row(s) processed
[2006-05-10 17:52:53 SGT] <WorkerThread2>  === Commit Internal Transaction
May 10 17:52:53 [Debugger]: [TimeSheetEntryPage ->getTimesheetWeek] 
getTimeSheetWeek() timesheet.weekOfYear()   selected year> 2006  selected 
weekOfYear> 18