How to schedule a cronjob to run every 15 mins ?

Hi,
I want to schedule a job to run every 15 mins through cron.
searched the forums and came up with this piece of code.i have given this in my crontab

 
0-59/15 * * * * sh /usr/ss/job

But its not being run. Have i made any mistake here.
Can any1 post the cron code for scheduling the job every 15 mins...

00,15,30,45 * * * * sh /usr/ss/job

0-59/15 * * * * sh /usr/ss/job

This will not run in Solaris. Whatz your flavour?

S

I use the following:

00, 15, 30, 45 * * * 0-6 /home/pgp/encyrptjob

# Min Hour Day Month Day
# of of of of of
# Hour Day Month Year Week Command
# (0-59) (0-23) (1-31) (1-12) (0-6) the directory and make the job executable

Lose the space characters between the "00,15,30,45" See kd07914 reply.

im using solaris. Please give a command that works on all flavors.