Help - Unix Scripting

Hi! could anyone help me?

I'm new in unix scripting, it seems that my script is not working, what I intend to do is send an e-mail to two different mail account depending on what time this script was run. The script always send mail on the mcthalla@yahoo.com even if the time is beyond 7pm. Here's my script

start_time=`date '+%H%M%S'`
print "IQ message count of $SAVE_IQ exceeded the 3K threshold." >> $IQ_COUNT_ALERT
if [ $start_time -ge 70000 ] and [ $start_time -le 190000 ]
then
mail -s "IQ Count Alert!"
mcthalla@yahoo.com<$IQ_COUNT_ALERT
else
mail -s "IQ Count Alert!"
tmureta@yahoo.com<$IQ_COUNT_ALERT
fi


runtime of the script was 214636, if this is the time, a mail should be sent to my tmureta@yahoo.com account
(stctst):/exchange/stc/ebill/scripts #./start_iq_count_messages.ksh
[YOU HAVE NEW MAIL]
time:214636

thanks,
mayette

Incredibly, ksh seems to accept your syntax without complaint. However it behaves as if the "and [ $start_time -le 190000 ]" was not present. Using the single bracket if, the syntax is:
if [ $start_time -ge 70000 -a $start_time -le 190000 ]

i don't like 'if' (as it's not needed)

SENDTO=mcthalla
[ $start_time -ge 70000 -a $start_time -le 190000 ] && SENDTO=tmureta

mail -s "IQ Count Alert!" ${SENDTO}@yahoo.com<$IQ_COUNT_ALERT