There are several ways to acomplish it.
The simplest way, is to construct the link with the values that the form is going to send.
Something like:
process.php?value1=somevalue&value2=someothervalue....
But you'll need some javascript to capture the values without the submit
Then the values will be available in the processing page.
The other way, is to have the rollover call a javascript function that will submit the form. something like onclick=this.form.submit()
The third ooption that invloves no javascript is to style the submit button using CSS to make it look like a rollover.
The first two rely heavily on javascript, which if turned off would render them useless, the third option relies on CSS which would require some coding to get the appearance right.
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.