calling function on submit instead of going to a new script

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Hi,

I'm using some form fields on a page to pick up existing data from a MySQL
database, make any changes, and update the database when i hit "submit".
I've picked up the data ok, now i want to process the update...

How do i call a function(?) on the same page rather than use another page
through action="somescript.php"?
what i'd like to do (in seudo-code) is:

<form action="myfunction()">
  ...
  <input type="submit">
</form>
myfunction(){
  process update & send user back to homepage
}


cheers,
Gav


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