Auto Form Submission

[preet]

The form code

--------------------
<form action="/?a=formhandler" method="post"
class="businesses-harvest-all-form">
<input type="hidden" name="next_url" value="/businesses"/>
<input type="hidden" name="formname"
value="RpcApiMogul_HarvestAllBusinessInstances"/>
<input type="hidden" name="origin_token"
value="2:O0Je7XEdJL1/iqZiQfiXY9VhPvs=:1265118779"/> <input
type="submit" class="submit-blue" value="Harvest All Resources">
</form>
-------------------

This form runs inside a frame on a page

Using gresemonkey as a handler for the script, how can i get this form
to auto submit every 5 minutes

What I wish to know is what part of the form do i need to catch to get
it to submit automatically.